To determine if 6405 is a prime number or a composite number, we simply look at the factors for 6405.
If the factors of 6405 are only 6405 and 1, then we know that 6405 is a prime number. Otherwise, 6405 is a composite number.
To explain better, if 6405 is only divisible by 1 and 6405, then it is a prime number, and if 6405 is divisible by more than 6405 and 1, then it is a composite number.
The factors of 6405 are as follows:
1, 3, 5, 7, 15, 21, 35, 61, 105, 183, 305, 427, 915, 1281, 2135, 6405
Therefore, since 6405 is divisible by more than one and itself, the answer to the
question "Is 6405 prime or composite?" is highlighted in blue below.
composite
Is 6406 prime or composite?
OK. Now you know that 6405 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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