To determine if 28 is a prime number or a composite number, we simply look at the factors for 28.
If the factors of 28 are only 28 and 1, then we know that 28 is a prime number. Otherwise, 28 is a composite number.
To explain better, if 28 is only divisible by 1 and 28, then it is a prime number, and if 28 is divisible by more than 28 and 1, then it is a composite number.
The factors of 28 are as follows:
1, 2, 4, 7, 14, 28
Therefore, since 28 is divisible by more than one and itself, the answer to the
question "Is 28 prime or composite?" is highlighted in blue below.
composite
Is 29 prime or composite?
OK. Now you know that 28 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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