To determine if 279 is a prime number or a composite number, we simply look at the factors for 279.
If the factors of 279 are only 279 and 1, then we know that 279 is a prime number. Otherwise, 279 is a composite number.
To explain better, if 279 is only divisible by 1 and 279, then it is a prime number, and if 279 is divisible by more than 279 and 1, then it is a composite number.
The factors of 279 are as follows:
1, 3, 9, 31, 93, 279
Therefore, since 279 is divisible by more than one and itself, the answer to the
question "Is 279 prime or composite?" is highlighted in blue below.
composite
Is 280 prime or composite?
OK. Now you know that 279 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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