To determine if 4 is a prime number or a composite number, we simply look at the factors for 4.
If the factors of 4 are only 4 and 1, then we know that 4 is a prime number. Otherwise, 4 is a composite number.
To explain better, if 4 is only divisible by 1 and 4, then it is a prime number, and if 4 is divisible by more than 4 and 1, then it is a composite number.
The factors of 4 are as follows:
1, 2, 4
Therefore, since 4 is divisible by more than one and itself, the answer to the
question "Is 4 prime or composite?" is highlighted in blue below.
composite
Is 5 prime or composite?
OK. Now you know that 4 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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