Yes, 31 is prime. The factors of 31 are 1 and 31 itself. Number with two factors is classified as prime numbers, numbers like 157, 211, 401 are prime numbers.

99 is not a prime number. The factors of 999 are 1, 3, 9, 27, 37, 111, 333 and 999. Therefore, we can say that 999 is composite.

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Last updated on December 2nd, 2024

Is 331 a Prime Number?

Q: How to check if a number is prime?

To check if a number is prime, we need to find the factors of the given number. If the number has 2 factors, then it’s a prime number. For example, 31 is a prime number with 1 and 331 as its only factors.

Q: How to write the prime number 397 in words?

The prime number 397 is written in words as ‘three hundred ninety seven’

Q: What are the multiples of 331?

331, 662, 993, 1324…. are the multiples of 331. Multiples are numbers obtained when another number multiplies the given number.

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Do you get confused while checking if a number is prime? Determining a prime number is easy. They are used in cybersecurity. Here, this article checks if 331 is a prime.

Why is 331 a prime number?

Since 331 has two factors, it is a prime number. The basic methods used to check if a number is prime are the counting divisors method, divisibility method, prime number chart, and prime factorization.

$is 331 a prime number$

Using the Counting Divisors Method

This method will tell the total number of divisors a number has.

The divisors of 331 = 1, 331

Therefore, 331 is a prime number.

Using the Divisibility Test Method

If a number has two factors, it is prime. Here, the factors of 331 are 1 and 331.

Using Prime Number Chart

This method will check if a number is prime or not with the help of a prime number chart. Only if the number is seen in the chart, then it's a prime.

Using the Prime Factorization Method

This method expresses the product of prime factors in its exponential form.

The prime factorization of 331 is → 1 × 331¹

Hence, the prime factor of 331 is 331

Common Mistakes to Avoid When Determining if 331 is a Prime Number

FAQs for ‘Is 331 is a Prime Number’

1.How to check if a number is prime?

2.How to write the prime number 397 in words?

3.Is 31 prime?

4.Is 999 prime?

5.What are the multiples of 331?

Important Glossaries for "Is 331 a Prime Number"

Prime Number: A number with two positive numbers as its only factors

Composite Number: A number with more than two positive numbers as factors

Prime Factorization: Method of expressing the product of prime factors in exponential form.

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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.