Yes, this is well known. All integral multiples of any perfect, or abundant number must be an abundant number.
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All of those numbers have an infinite amount of multiples.
No odd numbers are multiples of 4.
2, 4, 6 All even numbers have even multiples.
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.
all numbers that are multiples of 4 have 2 as factor