To determine if 125 is a prime number or a composite number, we simply look at the factors for 125.
If the factors of 125 are only 125 and 1, then we know that 125 is a prime number. Otherwise, 125 is a composite number.
To explain better, if 125 is only divisible by 1 and 125, then it is a prime number, and if 125 is divisible by more than 125 and 1, then it is a composite number.
The factors of 125 are as follows:
1, 5, 25, 125
Therefore, since 125 is divisible by more than one and itself, the answer to the
question "Is 125 prime or composite?" is highlighted in blue below.
composite
Is 126 prime or composite?
OK. Now you know that 125 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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