To determine if 1978 is a prime number or a composite number, we simply look at the factors for 1978.
If the factors of 1978 are only 1978 and 1, then we know that 1978 is a prime number. Otherwise, 1978 is a composite number.
To explain better, if 1978 is only divisible by 1 and 1978, then it is a prime number, and if 1978 is divisible by more than 1978 and 1, then it is a composite number.
The factors of 1978 are as follows:
1, 2, 23, 43, 46, 86, 989, 1978
Therefore, since 1978 is divisible by more than one and itself, the answer to the
question "Is 1978 prime or composite?" is highlighted in blue below.
composite
Is 1979 prime or composite?
OK. Now you know that 1978 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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