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Q: Numbers less than 10 that have exactly 2 factors?

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All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.

By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.

25 and 49

11

there are 3 no.2,3 & 5

14 (I think).

Just 36.

6, 8 and 10

24, 30 and 40

4 and 9

All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.

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