To determine if 155 is a prime number or a composite number, we simply look at the factors for 155.
If the factors of 155 are only 155 and 1, then we know that 155 is a prime number. Otherwise, 155 is a composite number.
To explain better, if 155 is only divisible by 1 and 155, then it is a prime number, and if 155 is divisible by more than 155 and 1, then it is a composite number.
The factors of 155 are as follows:
1, 5, 31, 155
Therefore, since 155 is divisible by more than one and itself, the answer to the
question "Is 155 prime or composite?" is highlighted in blue below.
composite
Is 156 prime or composite?
OK. Now you know that 155 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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