To determine if 605 is a prime number or a composite number, we simply look at the factors for 605.
If the factors of 605 are only 605 and 1, then we know that 605 is a prime number. Otherwise, 605 is a composite number.
To explain better, if 605 is only divisible by 1 and 605, then it is a prime number, and if 605 is divisible by more than 605 and 1, then it is a composite number.
The factors of 605 are as follows:
1, 5, 11, 55, 121, 605
Therefore, since 605 is divisible by more than one and itself, the answer to the
question "Is 605 prime or composite?" is highlighted in blue below.
composite
Is 606 prime or composite?
OK. Now you know that 605 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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