Number 657 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 657 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 657 below).

Number of factors: 6.

List of factors/divisors: 1, 3, 9, 73, 219, 657.

Parity: 657 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 305 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 650 no | 651 no | 652 no | 653 yes | 654 no | 655 no | 656 no | 657 no | 658 no | 659 yes | 660 no | 661 yes | 662 no | 663 no | 664 no |
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