Number 51 is not a prime number. It is a composite number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. We do not consider 51 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 51 below).

Number of factors: 4.

List of factors/divisors: 1, 3, 17, 51.

Parity: 51 is an odd number.

Perfect square: no (a square number or perfect square is an integer that is the square of an integer).

Perfect number: no, because the sum of its proper divisors is 21 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 44 no | 45 no | 46 no | 47 yes | 48 no | 49 no | 50 no | 51 no | 52 no | 53 yes | 54 no | 55 no | 56 no | 57 no | 58 no |
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