To determine if 765 is a prime number or a composite number, we simply look at the factors for 765.
If the factors of 765 are only 765 and 1, then we know that 765 is a prime number. Otherwise, 765 is a composite number.
To explain better, if 765 is only divisible by 1 and 765, then it is a prime number, and if 765 is divisible by more than 765 and 1, then it is a composite number.
The factors of 765 are as follows:
1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765
Therefore, since 765 is divisible by more than one and itself, the answer to the
question "Is 765 prime or composite?" is highlighted in blue below.
composite
Is 766 prime or composite?
OK. Now you know that 765 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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