That's an infinite list. Numbers with three factors are the squares of prime numbers.
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Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.
That depends what number you are trying to find the factors of - all those three numbers are factors of the number 18.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
All numbers have factors. The factors that are positive numbers are known as positive factors.