To determine if 2128 is a prime number or a composite number, we simply look at the factors for 2128.
If the factors of 2128 are only 2128 and 1, then we know that 2128 is a prime number. Otherwise, 2128 is a composite number.
To explain better, if 2128 is only divisible by 1 and 2128, then it is a prime number, and if 2128 is divisible by more than 2128 and 1, then it is a composite number.
The factors of 2128 are as follows:
1, 2, 4, 7, 8, 14, 16, 19, 28, 38, 56, 76, 112, 133, 152, 266, 304, 532, 1064, 2128
Therefore, since 2128 is divisible by more than one and itself, the answer to the
question "Is 2128 prime or composite?" is highlighted in blue below.
composite
Is 2129 prime or composite?
OK. Now you know that 2128 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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