To determine if 127 is a prime number or a composite number, we simply look at the factors for 127.
If the factors of 127 are only 127 and 1, then we know that 127 is a prime number. Otherwise, 127 is a composite number.
To explain better, if 127 is only divisible by 1 and 127, then it is a prime number, and if 127 is divisible by more than 127 and 1, then it is a composite number.
The factors of 127 are as follows:
1, 127
Therefore, since 127 is divisible by only one and itself, the answer to the
question "Is 127 prime or composite?" is highlighted in blue below.
prime
Is 128 prime or composite?
OK. Now you know that 127 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.

