# 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.

## 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 n
^{2}+ 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.

**☛ Also Check: **

- Is 65 a Prime Number? - No
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- Is 49 a Prime Number? - No
- Is 301 a Prime Number? - No
- Is 84 a Prime Number? - No
- Is 315 a Prime Number? - No

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