To determine if 387 is a prime number or a composite number, we simply look at the factors for 387.
If the factors of 387 are only 387 and 1, then we know that 387 is a prime number. Otherwise, 387 is a composite number.
To explain better, if 387 is only divisible by 1 and 387, then it is a prime number, and if 387 is divisible by more than 387 and 1, then it is a composite number.
The factors of 387 are as follows:
1, 3, 9, 43, 129, 387
Therefore, since 387 is divisible by more than one and itself, the answer to the
question "Is 387 prime or composite?" is highlighted in blue below.
composite
Is 388 prime or composite?
OK. Now you know that 387 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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