If the set of integers and the basic mathematical operators exist in a multiverse then there will be a transcendental and irrational real number that is the same value as pi (of this universe) and by the Euler’s Identity, there is also a number with the same value as e.
Would these constants also be found in the material fabric of that universe (such as how we can find them in this universe when you measure for example a wheel and its diameter) ? I don’t know but it seems logical that whilst the matter that the wheel is made of in that other universe would be impossible in this universe, the abstract of pi would be found in that exotic matter in the same way that we can find pi in matter in this universe.
This is not to say that there are multiverses but they may not be that strange to mathematicians.