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Can someone help me on problem 16

Can someone help me on problem 16-example-1

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Number 7 is prime because it has exactly two numbers which are 7x1
User ZeRj
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The number 7 is PRIME since it has EXACTLY 2 factors.

7 can only be divided by 1 and 7 and no other numbers, so it is prime.
User Kelyn
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