To determine if 77 is a prime number or a composite number, we simply look at the factors for 77.
If the factors of 77 are only 77 and 1, then we know that 77 is a prime number. Otherwise, 77 is a composite number.
To explain better, if 77 is only divisible by 1 and 77, then it is a prime number, and if 77 is divisible by more than 77 and 1, then it is a composite number.
The factors of 77 are as follows:
1, 7, 11, 77
Therefore, since 77 is divisible by more than one and itself, the answer to the
question "Is 77 prime or composite?" is highlighted in blue below.
composite
Is 78 prime or composite?
OK. Now you know that 77 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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