If k is any integer, then 11k is an integral multiple of 11.
111
You get integral multiples of the number.
There are ten different integral multiples of 10 that are equal or less than 100.
4
35 and all of its integral multiples
1601
Since 9 is not a prime, all [positive integral] multiples of 9 are exactly divisible.
The integral multiples are 5, 10, 15, 20, 25, 30, 35, 40, and 45.
All integral multiples of 180.
Harmonic Series
Yes, this is well known. All integral multiples of any perfect, or abundant number must be an abundant number.
It is conversion using multiples of integral powers of 10.