To determine if 120 is a prime number or a composite number, we simply look at the factors for 120.
If the factors of 120 are only 120 and 1, then we know that 120 is a prime number. Otherwise, 120 is a composite number.
To explain better, if 120 is only divisible by 1 and 120, then it is a prime number, and if 120 is divisible by more than 120 and 1, then it is a composite number.
The factors of 120 are as follows:
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
Therefore, since 120 is divisible by more than one and itself, the answer to the
question "Is 120 prime or composite?" is highlighted in blue below.
composite
Is 121 prime or composite?
OK. Now you know that 120 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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