To determine if 1530 is a prime number or a composite number, we simply look at the factors for 1530.
If the factors of 1530 are only 1530 and 1, then we know that 1530 is a prime number. Otherwise, 1530 is a composite number.
To explain better, if 1530 is only divisible by 1 and 1530, then it is a prime number, and if 1530 is divisible by more than 1530 and 1, then it is a composite number.
The factors of 1530 are as follows:
1, 2, 3, 5, 6, 9, 10, 15, 17, 18, 30, 34, 45, 51, 85, 90, 102, 153, 170, 255, 306, 510, 765, 1530
Therefore, since 1530 is divisible by more than one and itself, the answer to the
question "Is 1530 prime or composite?" is highlighted in blue below.
composite
Is 1531 prime or composite?
OK. Now you know that 1530 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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