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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.

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โˆ™ 2013-07-06 11:19:31
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Q: What is one technique that can help you figure out whether a number is prime or composite?
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How do you figure out a composite number?

A number can be factored to determine whether it is prime or composite. A prime number has exactly 2 factors, 1 and the number itself. A composite number has more than two factors.


How do you prove that a number is a composite?

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You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.


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