To determine if 1390 is a prime number or a composite number, we simply look at the factors for 1390.
If the factors of 1390 are only 1390 and 1, then we know that 1390 is a prime number. Otherwise, 1390 is a composite number.
To explain better, if 1390 is only divisible by 1 and 1390, then it is a prime number, and if 1390 is divisible by more than 1390 and 1, then it is a composite number.
The factors of 1390 are as follows:
1, 2, 5, 10, 139, 278, 695, 1390
Therefore, since 1390 is divisible by more than one and itself, the answer to the
question "Is 1390 prime or composite?" is highlighted in blue below.
composite
Is 1391 prime or composite?
OK. Now you know that 1390 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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