I can not say conclusively, though quantum mechanics can provide you with an estimate. The question is simple to come up with; the answer, to be sure, is another matter, both scientific and ontological.
The universe as such- or, to put it another way, all universes whatsoever- could be one grand set that is comprised of a number of sets, or a number of discrete sets unrelated to each other. In the first case, every universe is related to each other and is a part of the universe as a whole; in the second case, every universe is not related to the next though it is a part of the whole. The third case is this: there is no other universe apart from this one, and
this one contains no others "sets" within it.
Is there one set or a number of sets? Moreover, is the single set comprised of a number of sets, or one set alone? If the single set consists of a number of sets, are they related to each other or discrete and so unrelated to its "neighbor?" And, if there is one set exclusively, what is it made of?