1 x 63, 3 x 21, 7 x 9, 9 x 7, 21 x 3, 63 x 1.
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Since 63 is a multiple of 9, it is automatically the LCM.
The LCM of 9 and 21 is 63, which is the multiple of the highest power of prime factors from both numbers, is 63. (3² x 7 = 3 x 3 x 7 = 63).
There cannot be a least common multiple if there are not at least two numbers. The least common multiple is the smallest number that is a multiple of the two (or more) numbers. For example, the least common multiple of 4 and 6 is 12. The multiples of 63 are 63, 126, 189, 252, 315, 378, 441, ...
3, 7, 9
It is not possible to give a sensible answer to this question. The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question!