They are: 1, 3 and 9
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The factors are 1,3,5,9,15,45
6
Itself 9 which is an integer or a whole number but its factors are 1, 3 and 9
Any whole number that has a whole number divisor other than itself and 1 is composite. So 9 is composite since it is 3 times 3, as well as 9 times 1.
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