How does it exist though? Does it exist because we have a notation for it, or because we know its definition? Does the number 2 itself even exist? What does it mean to say that the number 2 exists?

Calculo, ergo sum?

> Calculo, ergo sum?

Pretty much:

https://en.wikipedia.org/wiki/Church_encoding

The number 2 simply exists independent of human intervention.

I am not convinced. There are no two equal things in nature. Numbering things, say apples, is a completely human abstraction over two different things.

How many units of protons does Helium have?