To determine if 105 is a prime number or a composite number, we simply look at the factors for 105.
If the factors of 105 are only 105 and 1, then we know that 105 is a prime number. Otherwise, 105 is a composite number.
To explain better, if 105 is only divisible by 1 and 105, then it is a prime number, and if 105 is divisible by more than 105 and 1, then it is a composite number.
The factors of 105 are as follows:
1, 3, 5, 7, 15, 21, 35, 105
Therefore, since 105 is divisible by more than one and itself, the answer to the
question "Is 105 prime or composite?" is highlighted in blue below.
composite
Is 106 prime or composite?
OK. Now you know that 105 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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