Number 721 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 721 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 721 below).

Number of factors: 4.

List of factors/divisors: 1, 7, 103, 721.

Parity: 721 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 111 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 714 no | 715 no | 716 no | 717 no | 718 no | 719 yes | 720 no | 721 no | 722 no | 723 no | 724 no | 725 no | 726 no | 727 yes | 728 no |
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