To determine if 1278 is a prime number or a composite number, we simply look at the factors for 1278.
If the factors of 1278 are only 1278 and 1, then we know that 1278 is a prime number. Otherwise, 1278 is a composite number.
To explain better, if 1278 is only divisible by 1 and 1278, then it is a prime number, and if 1278 is divisible by more than 1278 and 1, then it is a composite number.
The factors of 1278 are as follows:
1, 2, 3, 6, 9, 18, 71, 142, 213, 426, 639, 1278
Therefore, since 1278 is divisible by more than one and itself, the answer to the
question "Is 1278 prime or composite?" is highlighted in blue below.
composite
Is 1279 prime or composite?
OK. Now you know that 1278 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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