To determine if 678 is a prime number or a composite number, we simply look at the factors for 678.
If the factors of 678 are only 678 and 1, then we know that 678 is a prime number. Otherwise, 678 is a composite number.
To explain better, if 678 is only divisible by 1 and 678, then it is a prime number, and if 678 is divisible by more than 678 and 1, then it is a composite number.
The factors of 678 are as follows:
1, 2, 3, 6, 113, 226, 339, 678
Therefore, since 678 is divisible by more than one and itself, the answer to the
question "Is 678 prime or composite?" is highlighted in blue below.
composite
Is 679 prime or composite?
OK. Now you know that 678 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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