24
14 (I think).
the number 90 has the most factors under 100
The answer is 25 because it has the factors 1,5,25! :)
25
That would be 1. The only factor of 1 is 1. All other whole numbers have at least two factors. Prime numbers have exactly two factors, while composite numbers have more than two factors.
The smallest number that has exactly three factors is 4.
There are 12 numbers less than 150 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121,144.
24
14 (I think).
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
840
36
36
the number 90 has the most factors under 100
The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.
4, 9, 25