To determine if 84 is a prime number or a composite number, we simply look at the factors for 84.
If the factors of 84 are only 84 and 1, then we know that 84 is a prime number. Otherwise, 84 is a composite number.
To explain better, if 84 is only divisible by 1 and 84, then it is a prime number, and if 84 is divisible by more than 84 and 1, then it is a composite number.
The factors of 84 are as follows:
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Therefore, since 84 is divisible by more than one and itself, the answer to the
question "Is 84 prime or composite?" is highlighted in blue below.
composite
Is 85 prime or composite?
OK. Now you know that 84 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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