Ok stupid question but whats the last number ...is there one? If not does that mean the creator is one?

There is no highest number. There also is no lowdst number.

We use infinity and negative infinity for those.

There is no such thing as a highest possible number. No matter what number you have, there is always a larger one. (For example, you could always add 1 to your number to get a larger number).

What you may be intending to ask is "what is the largest number that anyone has ever decided to give a specific name to?" It is very important to understand that this is a completely different question from the one you asked, because it is a question about human culture not about mathematics.

The largest number that has a commonly-known specific name is a "googleplex", which is a 1 followed by a googol zeros, where a "googol" is (IMAGE) (a 1 followed by 100 zeros).

However, there would be nothing stopping you from giving a special name to a still larger number (such as a googleplex plus 1), and then that would become the largest named number once the term became commonly known.

There is no last number. If there were, call that N, but N+1 is larger than N and N+1 is also a number.

I'm not sure I understand the creator part of your question, but if the creator is a number then there is something greater than the creator. (That's not an impossibility. The creator has shown great engineering (physical and bioengineering) skill, but not anything outside an engineering skill set.)