To determine if 17 is a prime number or a composite number, we simply look at the factors for 17.
If the factors of 17 are only 17 and 1, then we know that 17 is a prime number. Otherwise, 17 is a composite number.
To explain better, if 17 is only divisible by 1 and 17, then it is a prime number, and if 17 is divisible by more than 17 and 1, then it is a composite number.
The factors of 17 are as follows:
1, 17
Therefore, since 17 is divisible by only one and itself, the answer to the
question "Is 17 prime or composite?" is highlighted in blue below.
prime
Is 18 prime or composite?
OK. Now you know that 17 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.
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