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Q: What whole number less than 100 have exactly 3 factors?

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The smallest number that has exactly three factors is 4.

The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.

16

95

24

There are 12 numbers less than 150 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121,144.

That would be 1. The only factor of 1 is 1. All other whole numbers have at least two factors. Prime numbers have exactly two factors, while composite numbers have more than two factors.

14 (I think).

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

840

24

48

36

36

49

49

105

the number 90 has the most factors under 100

4, 9, 25

105

27

The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.

It is 30.

The answer is 25 because it has the factors 1,5,25! :)

105 is one such number.