Is 321 a Prime Number?

Is 321 a prime number? Numbers having only 2 factors, i.e. 1 and the number itself are known as prime numbers whereas numbers with more than 2 factors are known as composite. The answer to the question whether 321 is a prime or composite is - "321 is a composite number." Now, let us find out how and why is 321 a prime number or a composite number?

• Is 321 a prime number? - No
• Is 321 a composite number? - Yes
• Factors of 321 - 1, 3, 107, 321
• Is 321 a perfect square? - No
• Prime Factors of 321 - 3, 107

Is 321 a Prime Number?

No, 321 is not a prime number. The number 321 is divisible by 1, 3, 107, 321. For a number to be classified as a prime number, it should have exactly two factors. Since 321 has more than two factors, i.e. 1, 3, 107, 321, it is not a prime number.

Why is 321 not a Prime Number?

To understand whether 321 is composite or prime, it is important to find its factors.

Factors of 321: 1, 3, 107, 321

Since 321 has more than 2 factors, we can say that 321 is not a prime number.

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Is 321 a Composite Number?

Yes, since 321 has more than two factors i.e. 1, 3, 107, 321. In other words, 321 is a composite number because 321 has more than 2 factors.

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Fun Facts:

• Euler discovered a polynomial n² + n + 41 that produces prime numbers for values of n that lie between 0 and 39 inclusive. It can generate 40 prime numbers for 0 <= n <= 39.
• Prime numbers greater than 5 can be represented in the form of either 6n + 1 or 6n - 1. Example - 71 is a prime number and it can be written as 71 = 6 × 12 - 1
• All primes except 2 are odd.

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