4, 9, 25
The smallest number that has exactly three factors is 4.
27
The square of any prime number has exactly three factors: 22, 32, 52, etc.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
105 is one such number.
How about 105 whose prime factors are 3, 5 and 7
105=3*5*7it has to be only three factors and they are all prime105
The number that is greater than 12, less than 40, and has exactly 3 factors is 25. A number has exactly 3 factors if it is the square of a prime number. In this case, 25 is the square of the prime number 5 (5² = 25), and it has the factors 1, 5, and 25.
24
9
14 (I think).
105