To determine if 129 is a prime number or a composite number, we simply look at the factors for 129.
If the factors of 129 are only 129 and 1, then we know that 129 is a prime number. Otherwise, 129 is a composite number.
To explain better, if 129 is only divisible by 1 and 129, then it is a prime number, and if 129 is divisible by more than 129 and 1, then it is a composite number.
The factors of 129 are as follows:
1, 3, 43, 129
Therefore, since 129 is divisible by more than one and itself, the answer to the
question "Is 129 prime or composite?" is highlighted in blue below.
composite
Is 130 prime or composite?
OK. Now you know that 129 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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