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# What is one technique that can help you figure out whether a number is prime or composite?

Wiki User

2013-07-06 11:19:31

Best Answer

However by looking at a number it is not easy to figure out whether a number is prime or composite.

Every even number excpet 2 is a composite number so, any number having last digit as 0, 2, 4, 6 or 8 is a composite number. This is one of the ways to figure out.

However for the odd numbers it becomes diificult to figure out.

For a quicker analysis there are divisiblity rules. These are shorthand ways to find whether a number is divisble by another without performing actual division.

Please take a look at the related links(below) for more information.

Wiki User

2013-07-06 11:19:31
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