Q: Numbers with exactly 3 factors

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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

That is correct -- all prime numbers have exactly two factors.

Related questions

All numbers that are the square of primes have exactly 3 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

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.

4 and 9

Prime squares have three factors. 4, 9, 25

2 4 6