To determine if 139 is a prime number or a composite number, we simply look at the factors for 139.
If the factors of 139 are only 139 and 1, then we know that 139 is a prime number. Otherwise, 139 is a composite number.
To explain better, if 139 is only divisible by 1 and 139, then it is a prime number, and if 139 is divisible by more than 139 and 1, then it is a composite number.
The factors of 139 are as follows:
1, 139
Therefore, since 139 is divisible by only one and itself, the answer to the
question "Is 139 prime or composite?" is highlighted in blue below.
prime
Is 140 prime or composite?
OK. Now you know that 139 is a prime 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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