Number 631 is a prime number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. Therefore we consider 631 as a prime number, because:

- 631 is a natural number greater than 1,
- 631 is not a product of 2 smaller natural numbers (it can be divided only by 1 and itself)

Number of factors: 2.

List of factors/divisors: 1, 631.

Parity: 631 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 1 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 624 no | 625 no | 626 no | 627 no | 628 no | 629 no | 630 no | 631 yes | 632 no | 633 no | 634 no | 635 no | 636 no | 637 no | 638 no |
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