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 or Composite?

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.

Is 15 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.

Problem Statements:

Is 15 a Prime Number?	No
Is 15 a Composite Number?	Yes
Is 15 a Perfect Square?	No
Multiples of 15	15, 30, 45, 60, 75, 90, 105, 120, 135, 150
Square Root of 15	3.872983
Is 15 an Even Number?	No
Cube Root of 15	2.46621
Is 15 a Perfect Cube?	No
Square of 15	225
Is 15 an Odd Number?	Yes

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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