To determine if 6400 is a prime number or a composite number, we simply look at the factors for 6400.
If the factors of 6400 are only 6400 and 1, then we know that 6400 is a prime number. Otherwise, 6400 is a composite number.
To explain better, if 6400 is only divisible by 1 and 6400, then it is a prime number, and if 6400 is divisible by more than 6400 and 1, then it is a composite number.
The factors of 6400 are as follows:
1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 256, 320, 400, 640, 800, 1280, 1600, 3200, 6400
Therefore, since 6400 is divisible by more than one and itself, the answer to the
question "Is 6400 prime or composite?" is highlighted in blue below.
composite
Is 6401 prime or composite?
OK. Now you know that 6400 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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