Number 309 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 309 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 309 below).

Number of factors: 4.

List of factors/divisors: 1, 3, 103, 309.

Parity: 309 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 107 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 302 no | 303 no | 304 no | 305 no | 306 no | 307 yes | 308 no | 309 no | 310 no | 311 yes | 312 no | 313 yes | 314 no | 315 no | 316 no |
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