To determine if 644 is a prime number or a composite number, we simply look at the factors for 644.
If the factors of 644 are only 644 and 1, then we know that 644 is a prime number. Otherwise, 644 is a composite number.
To explain better, if 644 is only divisible by 1 and 644, then it is a prime number, and if 644 is divisible by more than 644 and 1, then it is a composite number.
The factors of 644 are as follows:
1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644
Therefore, since 644 is divisible by more than one and itself, the answer to the
question "Is 644 prime or composite?" is highlighted in blue below.
composite
Is 645 prime or composite?
OK. Now you know that 644 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.
|
|
