Squares of prime numbers have exactly three factors.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
Prime squares
A number has exactly three factors if and only if it is the square of a prime number.
Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors
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.
The squares of all prime numbers above 2 have exactly 3 factors.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
Prime squares
A number has exactly three factors if and only if it is the square of a prime number.
2 and 3
3, 5 and 7
Oh, dude, 3 is a prime number because it can only be divided by 1 and itself. It's like the loner of the number world, only hanging out with 1 and 3. So yeah, 3 is definitely a prime number, no need to worry about it being a composite one.
4 and 9
Prime squares have three factors. 4, 9, 25