4 (factors 1, 2 and 4) and
9 (factors 1, 3 and 9) are two examples.
The squares of all prime numbers above 2 have exactly 3 factors.
2 and 3
3, 5 and 7
2 4 6
All numbers that are the square of primes have exactly 3 factors.
Squares of prime numbers have exactly three factors.
Numbers with exactly three factors are squares of prime numbers.
1, 2, 3, 5, and 7
there are 3 no.2,3 & 5
The factors of 81 that are between 2 and 10 are 3 and 9.
The squares of all prime numbers have exactly 3 factors. The numbers under fifty that are the squares of primes are 4 (1, 2, and 4), 9 (1, 3, and 9), 25 (1, 5, and 25), and 49 ( 1, 7, and 49).
Prime squares