Numeric prefixes for statamic fields

I’m really sorry if this is a dumb question. And please mark my question as a duplicate if needed…I just didn’t find an appropriate answer.

My problem can be found in the picture below.

And my question is…why does statamic prefix some fields with numbers allthough it is not possible to query them with grahql? And if it is possible to query them…how?

Thanks in advance and I’m really sorry again if it is a dumb question.