To determine if 165 is a prime number or a composite number, we simply look at the factors for 165.
If the factors of 165 are only 165 and 1, then we know that 165 is a prime number. Otherwise, 165 is a composite number.
To explain better, if 165 is only divisible by 1 and 165, then it is a prime number, and if 165 is divisible by more than 165 and 1, then it is a composite number.
The factors of 165 are as follows:
1, 3, 5, 11, 15, 33, 55, 165
Therefore, since 165 is divisible by more than one and itself, the answer to the
question "Is 165 prime or composite?" is highlighted in blue below.
composite
Is 166 prime or composite?
OK. Now you know that 165 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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