30 does.
2 x 3 x 5 = 30
The square of any prime number has exactly three factors: 22, 32, 52, etc.
30 = 2 x 3 x 5 = 30
Prime numbers
30 does.
They all are prime numbers except 1
27
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
How about 105 whose prime factors are 3, 5 and 7
30 (2 x 3 x 5) and 42 (2 x 3 x 7) are the only numbers less than 60 having three different prime factors.
30, 42, 66, 70 and 78.
105=3*5*7it has to be only three factors and they are all prime105
42 and its next three multiples.
4, 9, 25, and 49
105 is one such number.
2 x 3 x 5 = 30