To determine if 345 is a prime number or a composite number, we simply look at the factors for 345.
If the factors of 345 are only 345 and 1, then we know that 345 is a prime number. Otherwise, 345 is a composite number.
To explain better, if 345 is only divisible by 1 and 345, then it is a prime number, and if 345 is divisible by more than 345 and 1, then it is a composite number.
The factors of 345 are as follows:
1, 3, 5, 15, 23, 69, 115, 345
Therefore, since 345 is divisible by more than one and itself, the answer to the
question "Is 345 prime or composite?" is highlighted in blue below.
composite
Is 346 prime or composite?
OK. Now you know that 345 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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