Factors: 1, 3, 7, 21
Multiples: 21, 42, 63, 84 and so on.
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The prime factors of 63 are 3*3*7 . The non-prime factors are 9 and 21. The multiples of 63 are 63 * n where n is any number you feel like. The second part of this question is essentially meaningless.
The first five multiples of 21 are: 21, 42, 63, 84, 105.
It is always useful to know about factors and multiples.
Factors go into numbers, numbers go into multiples.
Factors go into the number. The number goes into multiples.