Number 691 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 691 as a prime number, because:

- 691 is a natural number greater than 1,
- 691 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, 691.

Parity: 691 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: | 684 no | 685 no | 686 no | 687 no | 688 no | 689 no | 690 no | 691 yes | 692 no | 693 no | 694 no | 695 no | 696 no | 697 no | 698 no |
---|