1 and 5
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All numbers have factors. The whole number factors of a composite number are the integers that combine in a multiplication sentence to make that number. In the sentence 5 x 6 = 30, 5 and 6 are factors of 30.
1, 3, 5 are all prime factors of 15 3 and 5 only. 1 is a special number that has no factors but itself yet it is not counted as a prime number.
The factors are: 1, 2, 4, 5, 10, 20, 25, 50, 100
Except for 5, all of them have more than two factors.
There is no such number. All multiples of 6 must have 1, 2, 3, and 6 as factors. And each one must have the number itself as a factor. That makes 5 factors. But if these are the only factors, then the number cannot be greater than 40.