To determine if 1981 is a prime number or a composite number, we simply look at the factors for 1981.
If the factors of 1981 are only 1981 and 1, then we know that 1981 is a prime number. Otherwise, 1981 is a composite number.
To explain better, if 1981 is only divisible by 1 and 1981, then it is a prime number, and if 1981 is divisible by more than 1981 and 1, then it is a composite number.
The factors of 1981 are as follows:
1, 7, 283, 1981
Therefore, since 1981 is divisible by more than one and itself, the answer to the
question "Is 1981 prime or composite?" is highlighted in blue below.
composite
Is 1982 prime or composite?
OK. Now you know that 1981 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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