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
24
9
14 (I think).
105
The one with less than three factors.