To determine if 378 is a prime number or a composite number, we simply look at the factors for 378.
If the factors of 378 are only 378 and 1, then we know that 378 is a prime number. Otherwise, 378 is a composite number.
To explain better, if 378 is only divisible by 1 and 378, then it is a prime number, and if 378 is divisible by more than 378 and 1, then it is a composite number.
The factors of 378 are as follows:
1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, 378
Therefore, since 378 is divisible by more than one and itself, the answer to the
question "Is 378 prime or composite?" is highlighted in blue below.
composite
Is 379 prime or composite?
OK. Now you know that 378 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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