3, 5, 9, 15, 25, 27, and 45 are some examples
That's an infinite list.
alot
25 and 49
Prime squares have three factors. 4, 9, 25
4, 9, 25 and 49 They are squares of prime numbers.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
Prime numbers like 2, 3, 5 and 7
Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5
Squares of prime numbers have exactly three factors.
Numbers with exactly three factors are squares of prime numbers.
All numbers that are the square of primes 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
The squares of all prime numbers above 2 have exactly 3 factors.
Prime numbers have exactly two factors. 3 has exactly two factors: 1 and 3. So 3 is prime. Composite numbers have more than two factors. 4 is composite because it has three factors: 1, 2, and 4.
A number has exactly three factors if and only if it is the square of a prime number.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
3 is a prime number because it has exactly two factors which are whole numbers: itself and one. This is the definition of a prime.
Squares of prime numbers, like 4, 9 and 25.
Prime squares have three factors. 4, 9, 25