To determine if 189 is a prime number or a composite number, we simply look at the factors for 189.
If the factors of 189 are only 189 and 1, then we know that 189 is a prime number. Otherwise, 189 is a composite number.
To explain better, if 189 is only divisible by 1 and 189, then it is a prime number, and if 189 is divisible by more than 189 and 1, then it is a composite number.
The factors of 189 are as follows:
1, 3, 7, 9, 21, 27, 63, 189
Therefore, since 189 is divisible by more than one and itself, the answer to the
question "Is 189 prime or composite?" is highlighted in blue below.
composite
Is 190 prime or composite?
OK. Now you know that 189 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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