Number 311 is a prime number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. Therefore we consider 311 as a prime number, because:

- 311 is a natural number greater than 1,
- 311 is not a product of 2 smaller natural numbers (it can be divided only by 1 and itself)

Number of factors: 2.

List of factors/divisors: 1, 311.

Parity: 311 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 1 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 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 | 317 yes | 318 no |
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