To determine if 1389 is a prime number or a composite number, we simply look at the factors for 1389.
If the factors of 1389 are only 1389 and 1, then we know that 1389 is a prime number. Otherwise, 1389 is a composite number.
To explain better, if 1389 is only divisible by 1 and 1389, then it is a prime number, and if 1389 is divisible by more than 1389 and 1, then it is a composite number.
The factors of 1389 are as follows:
1, 3, 463, 1389
Therefore, since 1389 is divisible by more than one and itself, the answer to the
question "Is 1389 prime or composite?" is highlighted in blue below.
composite
Is 1390 prime or composite?
OK. Now you know that 1389 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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