To determine if 278 is a prime number or a composite number, we simply look at the factors for 278.
If the factors of 278 are only 278 and 1, then we know that 278 is a prime number. Otherwise, 278 is a composite number.
To explain better, if 278 is only divisible by 1 and 278, then it is a prime number, and if 278 is divisible by more than 278 and 1, then it is a composite number.
The factors of 278 are as follows:
1, 2, 139, 278
Therefore, since 278 is divisible by more than one and itself, the answer to the
question "Is 278 prime or composite?" is highlighted in blue below.
composite
Is 279 prime or composite?
OK. Now you know that 278 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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