To determine if 243 is a prime number or a composite number, we simply look at the factors for 243.
If the factors of 243 are only 243 and 1, then we know that 243 is a prime number. Otherwise, 243 is a composite number.
To explain better, if 243 is only divisible by 1 and 243, then it is a prime number, and if 243 is divisible by more than 243 and 1, then it is a composite number.
The factors of 243 are as follows:
1, 3, 9, 27, 81, 243
Therefore, since 243 is divisible by more than one and itself, the answer to the
question "Is 243 prime or composite?" is highlighted in blue below.
composite
Is 244 prime or composite?
OK. Now you know that 243 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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