To determine if 398 is a prime number or a composite number, we simply look at the factors for 398.
If the factors of 398 are only 398 and 1, then we know that 398 is a prime number. Otherwise, 398 is a composite number.
To explain better, if 398 is only divisible by 1 and 398, then it is a prime number, and if 398 is divisible by more than 398 and 1, then it is a composite number.
The factors of 398 are as follows:
1, 2, 199, 398
Therefore, since 398 is divisible by more than one and itself, the answer to the
question "Is 398 prime or composite?" is highlighted in blue below.
composite
Is 399 prime or composite?
OK. Now you know that 398 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.
|
|
