Number 921 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 921 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 921 below).

Number of factors: 4.

List of factors/divisors: 1, 3, 307, 921.

Parity: 921 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 311 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 914 no | 915 no | 916 no | 917 no | 918 no | 919 yes | 920 no | 921 no | 922 no | 923 no | 924 no | 925 no | 926 no | 927 no | 928 no |
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