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39 49 69 99 are not a prime numbers because they have other factors aside from 1 and themselves.

The other factors of:

39 = 3, 13

49 = 7

69 = 3, 23

99 = 3, 9, 11, 33,

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12y ago
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Q: Why is 39 49 69 99 not a prime number?
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