To determine if 123 is a prime number or a composite number, we simply look at the factors for 123.
If the factors of 123 are only 123 and 1, then we know that 123 is a prime number. Otherwise, 123 is a composite number.
To explain better, if 123 is only divisible by 1 and 123, then it is a prime number, and if 123 is divisible by more than 123 and 1, then it is a composite number.
The factors of 123 are as follows:
1, 3, 41, 123
Therefore, since 123 is divisible by more than one and itself, the answer to the
question "Is 123 prime or composite?" is highlighted in blue below.
composite
Is 124 prime or composite?
OK. Now you know that 123 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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