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1. First multiply all numbers up from 2.

2. See how many numbers product is 5.

3. If is more than two numbers that's product is five that's a composite number.

4. Is the number only has to products that is five its a prime number.

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โˆ™ 2011-01-26 22:09:16
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Q: How can you tell without any calculations whether the number 5 is a prime or composite number?
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