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prime numbers are numbers that can only be divided by themselves and 1 (excluding the nuber 1 itself as it can only be divided by its self)

therefore 7 and 13 are prime because

5*3=1

9*3=27

13*3=39

and 3*17=51

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12y ago
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Q: What number is a prime number 7 13 15 27 39 51?
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