To determine if 393 is a prime number or a composite number, we simply look at the factors for 393.
If the factors of 393 are only 393 and 1, then we know that 393 is a prime number. Otherwise, 393 is a composite number.
To explain better, if 393 is only divisible by 1 and 393, then it is a prime number, and if 393 is divisible by more than 393 and 1, then it is a composite number.
The factors of 393 are as follows:
1, 3, 131, 393
Therefore, since 393 is divisible by more than one and itself, the answer to the
question "Is 393 prime or composite?" is highlighted in blue below.
composite
Is 394 prime or composite?
OK. Now you know that 393 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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