Any number multiplied by zero is zero. If I have a million dollars and I give it to you zero times, how many times have I given you a million dollars?
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Not necessarily. A number is also a multiple of itself.
No. Every non-zero whole number is a multiple of 1.
It has to be a whole number, or else every number would be a multiple of every other number.
Not in the normal usage of the words. Usually, a number is considered to be a multiple of another number only of there is an integer you can multiply the other number by in order to get the first number. If you allowed multiplication by non-integers, then every number would be a multiple of every other number except zero and the term "multiple" would be fairly useless. So in the normal way of speaking, 39 is not a multiple of 6 because there is no integer (whole number) you can multiply 6 by in order to get 39.
Every number is divisible by any non-zero number. Whether or not it is evenly divisible depends on the value of Y.