Number 280 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 280 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 280 below).

Number of factors: 16.

List of factors/divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280.

Parity: 280 is an even number. It means it is divisible by 2 with no remainder.

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 440 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 273 no | 274 no | 275 no | 276 no | 277 yes | 278 no | 279 no | 280 no | 281 yes | 282 no | 283 yes | 284 no | 285 no | 286 no | 287 no |
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