[protonfish]

Numbers are not physical things, they are symbols that are part of a system that has changed significantly over years. We can make a metaphorical link between a number and a measurement of our universe, but that does not mean that numbers are part of the physical world.

[cgh]

They may not be part of our physical world but that does not mean they don't exist independently:

https://plato.stanford.edu/entries/platonism-mathematics/#Ex...