To determine if 45 is a prime number or a composite number, we simply look at the factors for 45.
If the factors of 45 are only 45 and 1, then we know that 45 is a prime number. Otherwise, 45 is a composite number.
To explain better, if 45 is only divisible by 1 and 45, then it is a prime number, and if 45 is divisible by more than 45 and 1, then it is a composite number.
The factors of 45 are as follows:
1, 3, 5, 9, 15, 45
Therefore, since 45 is divisible by more than one and itself, the answer to the
question "Is 45 prime or composite?" is highlighted in blue below.
composite
Is 46 prime or composite?
OK. Now you know that 45 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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