The squares of all prime numbers above 2 have exactly 3 factors.
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they are called numbers with 3 factors
The answer depends on what the numbers have more of when 3 factors!
All numbers that are the square of primes have exactly 3 factors.
Numbers with exactly three factors are squares of prime numbers.
4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.