To determine if 1665 is a prime number or a composite number, we simply look at the factors for 1665.
If the factors of 1665 are only 1665 and 1, then we know that 1665 is a prime number. Otherwise, 1665 is a composite number.
To explain better, if 1665 is only divisible by 1 and 1665, then it is a prime number, and if 1665 is divisible by more than 1665 and 1, then it is a composite number.
The factors of 1665 are as follows:
1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1665
Therefore, since 1665 is divisible by more than one and itself, the answer to the
question "Is 1665 prime or composite?" is highlighted in blue below.
composite
Is 1666 prime or composite?
OK. Now you know that 1665 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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