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All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a Prime number.

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13y ago

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More answers

A prime number has only two factors which are itself and one whereas composite numbers have more than two factors

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Wiki User

10y ago
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tow number having only 1 as a common factor are called co- prime number

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Anonymous

4y ago
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