To determine if 397 is a prime number or a composite number, we simply look at the factors for 397.
If the factors of 397 are only 397 and 1, then we know that 397 is a prime number. Otherwise, 397 is a composite number.
To explain better, if 397 is only divisible by 1 and 397, then it is a prime number, and if 397 is divisible by more than 397 and 1, then it is a composite number.
The factors of 397 are as follows:
1, 397
Therefore, since 397 is divisible by only one and itself, the answer to the
question "Is 397 prime or composite?" is highlighted in blue below.
prime
Is 398 prime or composite?
OK. Now you know that 397 is a prime 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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