If one natural number can exactly divide another natural number, then the first number is called the factor of the other number. For example; 5 can divide 15 therefore 5 is a factor of 15.
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Some of the numbers got many factors and some other numbers got a few.
But all the numbers have at least two factors which are number itself and number "1".
For example; consider number 15 again, in addition to 5, there are 15 itself, 1 and 3 are also the factors of 15.
WRITING ALL THE FACTORS OF A NUMBER
ALL THE FACTORS OF 15 = 1, 3, 5, 15
ALL THE FACTORS OF 18 = 1, 2, 3, 6, 9, 18
Similarly you can find all the factors of many numbers. If you want to learn this concept from a video lesson than follow the next link: Khan Academy Factoring Numbers
