To determine if 1221 is a prime number or a composite number, we simply look at the factors for 1221.
If the factors of 1221 are only 1221 and 1, then we know that 1221 is a prime number. Otherwise, 1221 is a composite number.
To explain better, if 1221 is only divisible by 1 and 1221, then it is a prime number, and if 1221 is divisible by more than 1221 and 1, then it is a composite number.
The factors of 1221 are as follows:
1, 3, 11, 33, 37, 111, 407, 1221
Therefore, since 1221 is divisible by more than one and itself, the answer to the
question "Is 1221 prime or composite?" is highlighted in blue below.
composite
Is 1222 prime or composite?
OK. Now you know that 1221 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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