Number 55 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 55 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 55 below).

Number of factors: 4.

List of factors/divisors: 1, 5, 11, 55.

Parity: 55 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 17 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 48 no | 49 no | 50 no | 51 no | 52 no | 53 yes | 54 no | 55 no | 56 no | 57 no | 58 no | 59 yes | 60 no | 61 yes | 62 no |
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