Number 243 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 243 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 243 below).

Number of factors: 6.

List of factors/divisors: 1, 3, 9, 27, 81, 243.

Parity: 243 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 121 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 236 no | 237 no | 238 no | 239 yes | 240 no | 241 yes | 242 no | 243 no | 244 no | 245 no | 246 no | 247 no | 248 no | 249 no | 250 no |
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