To determine if 777 is a prime number or a composite number, we simply look at the factors for 777.
If the factors of 777 are only 777 and 1, then we know that 777 is a prime number. Otherwise, 777 is a composite number.
To explain better, if 777 is only divisible by 1 and 777, then it is a prime number, and if 777 is divisible by more than 777 and 1, then it is a composite number.
The factors of 777 are as follows:
1, 3, 7, 21, 37, 111, 259, 777
Therefore, since 777 is divisible by more than one and itself, the answer to the
question "Is 777 prime or composite?" is highlighted in blue below.
composite
Is 778 prime or composite?
OK. Now you know that 777 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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