# Is 51 a Prime Number?

Is 51 a prime number? * "No, 51 is not a prime number."* A number can be classified as prime or composite depending on the factors it contains; it could either have only 2 factors or more than 2 factors. Numbers like 223 with only 2 factors, i.e. 1 and 223 are called prime numbers. However, numbers like 429 with more than 2 factors are called composite numbers. Let us find out how and why is 51 a prime number or a composite number?

**Is 51 a prime number? -**No**Is 51 a composite number? -**Yes**Prime Factors of 51 -**3, 17**Factors of 51 -**1, 3, 17, 51**Is 51 a perfect square? -**No

## Is 51 a Prime Number?

No, 51 is not a prime number. The number 51 is divisible by 1, 3, 17, 51. For a number to be classified as a prime number, it should have exactly two factors. Since 51 has more than two factors, i.e. 1, 3, 17, 51, it is not a prime number.

## Why is 51 not a Prime Number?

To understand whether 51 is composite or prime, it is important to find its factors.

**Factors of 51:** 1, 3, 17, 51

Since 51 has more than 2 factors, we can say that 51 is not a prime number.

## Is 51 a Composite Number?

Yes, since 51 has more than two factors i.e. 1, 3, 17, 51. In other words, 51 is a composite number because 51 has more than 2 factors.

**Problem Statements: **

Is 51 a Prime Number? | No |

Is 51 a Composite Number? | Yes |

Is 51 a Perfect Cube? | No |

Square of 51 | 2601 |

Cube Root of 51 | 3.708425 |

Square Root of 51 | 7.141428 |

Is 51 a Perfect Square? | No |

Is 51 an Even Number? | No |

Is 51 an Odd Number? | Yes |

Multiples of 51 | 51, 102, 153, 204, 255, 306, 357, 408, 459, 510 |

**Fun Facts: **

- 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 only prime number that is even.
- A semiprime number is a composite number that is the product of exactly two prime numbers. Example - 611 is semiprime, since 611 can be written as 13 × 47.

**☛ Also Check: **

- Is 69 a Prime Number? - No
- Is 35 a Prime Number? - No
- Is 103 a Prime Number? - Yes
- Is 107 a Prime Number? - Yes
- Is 1 a Prime Number? - No
- Is 241 a Prime Number? - Yes
- Is 44 a Prime Number? - No
- Is 881 a Prime Number? - Yes

visual curriculum