Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.
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Prime numbers have two factors. 2, 3 and 5 are prime numbers.
All prime numbers have only two factors. 2, 3, 5, 7, 11
They are: 2, 3 and 5
Numbers with 3 or 5 factors are called square numbers.
Prime factors of 18 are 2 and 3 Prime factors of 45 are 3 and 5