To determine if 138 is a prime number or a composite number, we simply look at the factors for 138.
If the factors of 138 are only 138 and 1, then we know that 138 is a prime number. Otherwise, 138 is a composite number.
To explain better, if 138 is only divisible by 1 and 138, then it is a prime number, and if 138 is divisible by more than 138 and 1, then it is a composite number.
The factors of 138 are as follows:
1, 2, 3, 6, 23, 46, 69, 138
Therefore, since 138 is divisible by more than one and itself, the answer to the
question "Is 138 prime or composite?" is highlighted in blue below.
composite
Is 139 prime or composite?
OK. Now you know that 138 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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