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It's not clear what you're asking. You're aware of the counting numbers from 1 to 20. They're all numbers. They all have multiples or can be multiples.
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The multiples of 4 up to 30 are: 4, 8, 12, 16, 20, 24, 28.
30, 60, 90 and so on. Multiples of 30.
The first multiples of 15 are 15, 30, 45, 60, 75, and so on. The first multiples of 4 are 4, 8, 12, 16, 20, and so forth. Multiples are numbers that can be divided evenly by another number.
A single number cannot have common multiples, until you are comparing it with one or more other numbers.