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Last updated on May 26th, 2025

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Is 89 a Prime Number?

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When is a number prime? A number is a prime when it has only 2 factors, 1 and itself. We use prime numbers in our daily lives in places like Computer coding and the medical field. Now let us learn what a prime number is and why 89 is a prime number.

Is 89 a Prime Number? for US Students
Professor Greenline from BrightChamps

Is 89 a Prime Number?

There are many types of numbers, like prime numbers and composite numbers. 89 is a prime number. We can get a prime number using a number of techniques. Now, let us understand what are those techniques.
 

Professor Greenline from BrightChamps

Why Is 89 A Prime Number?

A number can be prime only if it meets these 2 criteria:

 

  • It should be a number greater than 1 and a whole number.
  • It should have only 2 divisors. (1 and itself)

 

The number is prime if both of the above conditions are met. There are some ways by which a prime number can be determined. Some of them are mentioned below.

 

 

  1. Counting Divisor Method
  2. Divisibility Test
  3. Prime Number Chart
  4. Prime Factorization

 

Let's consider these methods and see why 89 is a prime number.
 

Professor Greenline from BrightChamps

Using the Counting Divisors Method

Here we would see how many divisors 89 carries. If it has 2 divisors, it is a prime number.

 

  • Let us write down how many divisors 89 has.

 

  • Number of divisors for 89–1 and 89


We can clearly see that 89 has only 2 divisors. So we can say that 89 is a prime number.
 

Professor Greenline from BrightChamps

Using the Divisibility Test Method

Here we are going to see whether 89 is divisible by some other number or not. Let's check for 2, 3, 5, and 7.

 

  • Only if the last digit is even, it is a multiple of 2. Number 9 is not a multiple of 2. Then 89 can not be a multiple of 2.

 

  • A number is a multiple of 3 if the sum of the digits is a multiple of 3.

 

For example, 36. The sum of 3+6=9. Now, that is a multiple of 3. So, 36 is a multiple of 3. Now, look at the case with 89, the sum of 8 and 9 is 17 (8+9=17). Number 17 is not a multiple of 3 and so 89 is not divisible by 3.

  • A number is divisible by 5 if it is either with a 0 or 5. But 89 ends with a 9. Due to this, 89 is never divisible by 5.

 

  • The above number 89 has to be a multiple of 7 for being divisible by 7. So, the last digit 9 has to be doubled and that will give us 9×2=18 and that should be subtracted with the other digit 8. Then we get the result of 10. 18-8=10. This is not a multiple of 7. So 89 cannot be divided.
     
Professor Greenline from BrightChamps

Using Prime Number Chart

This is the easiest way of finding a prime number. We would have a list of all the prime numbers, and we can check if the number given is a prime number. Let's see the prime numbers from 1 to 100.

 

 

 

 

The table has the number 89. We know it is a prime number.
 

Professor Greenline from BrightChamps

Using the Prime Factorization Method

Here we break the big numbers into small prime numbers to confirm the number of factors they have. But it is not used for prime numbers.
 

Max Pointing Out Common Math Mistakes

Common Mistakes to Avoid When Determining if 89 is a Prime Number

Let's have some simple mistakes which the children make while calculating the prime numbers and a probable solution to them
 

Mistake 1

Red Cross Icon Indicating Mistakes to Avoid in This Math Topic

89 is a prime number because it is big.
 

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Just because 89 is a big odd number, it does not make it a prime number. We have to check it with one of the methods and then finalize the answer.
 

Ray Thinking Deeply About Math Problems

FAQs of “Is 89 a prime number?”

1.What is the LCM of 89 and 98?

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2.What is GCF of 89 and 9?

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3.Is 89 a composite number?

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4.What are the first 10 multiples of the number 89?

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5.How can children in United States use numbers in everyday life to understand Is 89 a Prime Number??

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6.What are some fun ways kids in United States can practice Is 89 a Prime Number? with numbers?

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7.What role do numbers and Is 89 a Prime Number? play in helping children in United States develop problem-solving skills?

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8.How can families in United States create number-rich environments to improve Is 89 a Prime Number? skills?

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Professor Greenline from BrightChamps

Important Glossaries for "Is 89 a Prime Number"

  • Composite number- A number which has more than 1 factor is called a composite number.
  •  

For example, — 18 is factorized into 2×32, hence it is a composite number.

 

  • Multiple-The product we get while multiplying a number with other numbers.

Example:- 9×2=18, 9×3=27. Here, 18 and 27 are a multiple of 9.

 

  • Factor-A number, if multiplied with other number, gives us the required number.

Example, 9×2=18, 9×3=27. In that, 2 and 3 are factors

 

  • Square of a number-The product we get while a number is multiplied by itself.

For example, 2 2 = 4; 3 3 = 9; 4 × 4 = 16. That may be represented as 2², 3², 4².
 

Professor Greenline from BrightChamps

About BrightChamps in United States

At BrightChamps, we know numbers are more than just digits—it’s a way to open doors to countless opportunities! Our mission is to help kids all across the United States grasp important math skills, like today’s focus on the Is 89 a Prime Number? with a special focus on understanding prime numbers—in a way that’s lively, enjoyable, and easy to follow. Whether your child is figuring out how fast a roller coaster speeds through Disney World, keeping track of scores at a Little League baseball game, or managing their allowance to buy the latest gadgets, mastering numbers gives them the confidence they need for everyday challenges. Our interactive lessons make learning both simple and fun. Because kids in the USA learn in many different ways, we tailor our approach to fit each child’s unique style. From the bustling streets of New York City to the sunny shores of California, BrightChamps brings math to life, making it relatable and exciting throughout America. Let’s make prime numbers a fun part of every child’s math journey!
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Hiralee Lalitkumar Makwana

About the Author

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.

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Max, the Girl Character from BrightChamps

Fun Fact

: She loves to read number jokes and games.

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