The smallest number that has exactly three factors is 4.
The one with less than three factors.
the number is 18
The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.
30 does.
25
25
27
14
4, 9, 25
105 is one such number.
How about 105 whose prime factors are 3, 5 and 7
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.