To determine if 309 is a prime number or a composite number, we simply look at the factors for 309.
If the factors of 309 are only 309 and 1, then we know that 309 is a prime number. Otherwise, 309 is a composite number.
To explain better, if 309 is only divisible by 1 and 309, then it is a prime number, and if 309 is divisible by more than 309 and 1, then it is a composite number.
The factors of 309 are as follows:
1, 3, 103, 309
Therefore, since 309 is divisible by more than one and itself, the answer to the
question "Is 309 prime or composite?" is highlighted in blue below.
composite
Is 310 prime or composite?
OK. Now you know that 309 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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