To determine if 145 is a prime number or a composite number, we simply look at the factors for 145.
If the factors of 145 are only 145 and 1, then we know that 145 is a prime number. Otherwise, 145 is a composite number.
To explain better, if 145 is only divisible by 1 and 145, then it is a prime number, and if 145 is divisible by more than 145 and 1, then it is a composite number.
The factors of 145 are as follows:
1, 5, 29, 145
Therefore, since 145 is divisible by more than one and itself, the answer to the
question "Is 145 prime or composite?" is highlighted in blue below.
composite
Is 146 prime or composite?
OK. Now you know that 145 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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