Number 621 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 621 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 621 below).

Number of factors: 8.

List of factors/divisors: 1, 3, 9, 23, 27, 69, 207, 621.

Parity: 621 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 339 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 614 no | 615 no | 616 no | 617 yes | 618 no | 619 yes | 620 no | 621 no | 622 no | 623 no | 624 no | 625 no | 626 no | 627 no | 628 no |
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