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Q: What numbers with exactly 3 factors are?

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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.

Prime squares

By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.

2 and 3

Prime squares

Squares of prime numbers.

3, 5 and 7

25 and 49

That's an infinite list.

4 and 9

prime squares

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.

All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.

All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

Prime squares have three factors. 4, 9, 25

2 4 6

Squares of prime numbers, like 4, 9 and 25.

Numbers with three factors are squares of primes. So: 4, 9, 25

4 (factors 1, 2 and 4) and 9 (factors 1, 3 and 9) are two examples.

Prime numbers.

Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors

Prime numbers are the numbers that have exactly two factors.Prime numbers have only two factors, the number one and themselves.