The factors of 4 are 1, 2, and 4 .
I think that it is 4
The smallest number that has exactly eight factors is 24. The factors of 1,2,3,4,6,8,12, and 24
I belive it is 4. The factors of 4 are 1,4, and 2.
6
192
12
192
6
4096
1024
The smallest number that has exactly three factors is 4.
The smallest is 192 but there are infinitely many such numbers. For example, take any prime number to the 13th power and the result will have exactly fourteen factors. The smallest is 192.