To determine if 231 is a prime number or a composite number, we simply look at the factors for 231.
If the factors of 231 are only 231 and 1, then we know that 231 is a prime number. Otherwise, 231 is a composite number.
To explain better, if 231 is only divisible by 1 and 231, then it is a prime number, and if 231 is divisible by more than 231 and 1, then it is a composite number.
The factors of 231 are as follows:
1, 3, 7, 11, 21, 33, 77, 231
Therefore, since 231 is divisible by more than one and itself, the answer to the
question "Is 231 prime or composite?" is highlighted in blue below.
composite
Is 232 prime or composite?
OK. Now you know that 231 is a composite number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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