Number 663 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 663 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 663 below).

Number of factors: 8.

List of factors/divisors: 1, 3, 13, 17, 39, 51, 221, 663.

Parity: 663 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 345 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 656 no | 657 no | 658 no | 659 yes | 660 no | 661 yes | 662 no | 663 no | 664 no | 665 no | 666 no | 667 no | 668 no | 669 no | 670 no |
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