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Q: What are all the numbers that have three factors?

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Factors don't have numbers. Numbers have factors. Numbers that have the factors 2, 4 and 8 are 8 and all of its multiples.

Squares of prime numbers have only three factors.

They are all prime numbers. They are all consecutive odd numbers They are all factors of 105

Calculate the least common multiple of the three numbers. Any multiple of that has all those numbers as factors.

Three factors

Composite numbers

All numbers have factors.

Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.

They don't. 21 has two prime factors. 42 has three prime factors.

All prime squares have just three factors. Example: 9, 25

The only factors common to all three numbers are... 1 & 5

Numbers with exactly three factors are squares of prime numbers.

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