Is 759 a Prime Number?

There are two types of numbers, mostly —

prime numbers and composite numbers, depending on the number of factors.

A prime number is a natural number that is divisible only by 1 and itself.

For example, 5 is a prime number because it is divisible by 1 and itself.

A composite number is a positive number that is divisible by more than two numbers.

For example, 12 is divisible by 1, 2, 3, 4, 6, and 12, making it a composite number.

• Prime numbers follow a few properties like:
   
• Prime numbers are positive numbers always greater than 1. 
   
• 2 is the only even prime number.
   
• They have only two factors: 1 and the number itself.
   
• Any two distinct prime numbers are co-prime numbers because they have only one common factor, which is 1.
   
• Since 759 has more than two factors, it is not a prime number.

The characteristic of a prime number is that it has only two divisors: 1 and itself. Since 759 has more than two factors, it is not a prime number. Few methods are used to distinguish between prime and composite numbers. A few methods are:

• Counting Divisors Method 
   
• Divisibility Test 
   
• Prime Number Chart 
   
• Prime Factorization

The method in which we count the number of divisors to categorize the numbers as prime or composite is called the counting divisors method. Based on the count of the divisors, we categorize prime and composite numbers. - If there is a total count of only 2 divisors, then the number would be prime. - If the count is more than 2, then the number is composite. Let’s check whether 759 is prime or composite.

Step 1: All numbers are divisible by 1 and itself.

Step 2: Divide 759 by 2. It is not divisible by 2, so 2 is not a factor of 759.

Step 3: Divide 759 by 3. It is divisible by 3, so 3 is a factor of 759.

Step 4: You can simplify checking divisors up to 759 by finding the square root value. We then need to only check divisors up to the square root value.

Step 5: When we divide 759 by 3, 11, and 69, it is divisible by these numbers.

Since 759 has more than 2 divisors, it is a composite number.

We use a set of rules to check whether a number is divisible by another number completely or not. It is called the Divisibility Test Method. 

Divisibility by 2: The number in the ones' place value is 9. Since 9 is an odd number, 759 is not divisible by 2.

Divisibility by 3: The sum of the digits in the number 759 is 21. Since 21 is divisible by 3, 759 is also divisible by 3. 

Divisibility by 5: The unit’s place digit is 9. Therefore, 759 is not divisible by 5. 

Divisibility by 7: Double the last digit (9 × 2 = 18). Subtract this from the rest of the number (75 - 18 = 57). Since 57 is not divisible by 7, 759 is not divisible by 7. 

Divisibility by 11: In 759, the sum of the digits in odd positions is 14, and the sum of the digits in even positions is 5. The difference is 9, which is not divisible by 11. Hence, 759 is not divisible by 11.

Since 759 is divisible by 3, it has more than two factors. Therefore, it is a composite number.

The prime number chart is a tool created by using a method called “The Sieve of Eratosthenes.” In this method, we follow the following steps.

Step 1: Write numbers from 1 to 1000 in a structured format.

Step 2: Leave 1 without marking, as it is neither prime nor composite.

Step 3: Mark 2 because it is a prime number and cross out all the multiples of 2.

Step 4: Mark 3 because it is a prime number and cross out all the multiples of 3.

Step 5: Repeat this process until you reach higher numbers. Through this process, we will have a list of prime numbers.

759 is not present in the list of prime numbers, so it is a composite number.

Prime factorization is a process of breaking down a number into prime factors. Then multiply those factors to obtain the original number.

Step 1: We can write 759 as 3 × 253.

Step 2: In 3 × 253, 253 is a composite number. Further, break 253 into 11 × 23.

Step 3: Now we get the product consisting of only prime numbers.

Hence, the prime factorization of 759 is 3 × 11 × 23.

• Composite numbers: Natural numbers greater than 1 that are divisible by more than 2 numbers are called composite numbers. For example, 12 is a composite number because 12 is divisible by 1, 2, 3, 4, 6, and 12.
   
• Divisibility rules: A set of rules to determine if a number is divisible by another number without doing long division.
   
• Prime factorization: The process of expressing a number as a product of its prime factors.
   
• Sieve of Eratosthenes: An ancient algorithm used to find all prime numbers up to a specified integer.
   
• Co-prime numbers: Two numbers that have only 1 as their common factor.