1,3,5 and 15
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Any whole number (integer) has factors. Factors are numbers that can be divided into another number. For example the factors of 15 are: 1, 3, 5 and 15 (1 times 15 and 3 times 5)
To find the factors of a number, you first need to split that number into its prime factors. In the case of 15, this produces: 15 = 3x5 The next step is to note that every factor of the number (apart from 1) is the product of any combination of its prime factors. Thus, the factors of 15 are: 1, 3, 5 and 15.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
3, 5
Factors are the numbers you multiple together to get another number. 15: 1, 3, 5, 15