A prime number has exactly two factors.
Squares of prime numbers have exactly three factors.
The smallest number with exactly eight factors is 24.
12 has exactly 6 factors ^.^ 1x12 3x4 2x6
exactly 2
Well, If we looked at this way: (224) = 16777216, so this number has exactly 24 factors. (324) = 282429536481, so this number has exactly 24 factors. (510)(210)(34) = 810000000000, so this number has exactly 24 factors.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
All prime squares have exactly three factors.49 has exactly three factors: 1, 7, and 49.
Numbers with exactly three factors are squares of prime numbers.
A number has exactly three factors if and only if it is the square of a prime number.
A number that has exactly two (positive) factors is called a prime number. For instance, the only factors of 7 are 1 and 7.
36 has 9 factors.