Is 15 a Prime Number?

Is 15 a prime number? If a number has only two factors, i.e. 1 and the number itself, it is known as a prime number. In contrast, composite numbers have more than two factors. By this explanation, can we answer the question - is 15 a prime number? According to the definition mentioned above, we can say "No, 15 is not a prime number." Now let us take a look at the detailed solution of why is 15 a prime number or a composite number?

• Is 15 a prime number? - No
• Is 15 a composite number? - Yes
• Factors of 15 - 1, 3, 5, 15
• Prime Factors of 15 - 3, 5
• Is 15 a perfect square? - No

Is 15 a Prime Number?

No, 15 is not a prime number. The number 15 is divisible by 1, 3, 5, 15. For a number to be classified as a prime number, it should have exactly two factors. Since 15 has more than two factors, i.e. 1, 3, 5, 15, it is not a prime number.

Why is 15 not a Prime Number?

To understand whether 15 is composite or prime, it is important to find its factors.

Factors of 15: 1, 3, 5, 15

Since 15 has more than 2 factors, we can say that 15 is not a prime number.

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Is 15 a Composite Number?

Yes, since 15 has more than two factors i.e. 1, 3, 5, 15. In other words, 15 is a composite number because 15 has more than 2 factors.

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Fun Facts:

• A semiprime number is a composite number that is the product of exactly two prime numbers. Example - 115 is semiprime, since 115 can be written as 5 × 23.
• 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.
• 2 is the smallest prime number.

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