To determine if 1605 is a prime number or a composite number, we simply look at the factors for 1605.
If the factors of 1605 are only 1605 and 1, then we know that 1605 is a prime number. Otherwise, 1605 is a composite number.
To explain better, if 1605 is only divisible by 1 and 1605, then it is a prime number, and if 1605 is divisible by more than 1605 and 1, then it is a composite number.
The factors of 1605 are as follows:
1, 3, 5, 15, 107, 321, 535, 1605
Therefore, since 1605 is divisible by more than one and itself, the answer to the
question "Is 1605 prime or composite?" is highlighted in blue below.
composite
Is 1606 prime or composite?
OK. Now you know that 1605 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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