No it’s not. If charged with murder courts will hear it.
The House and Senate will hear it.
The subject came up in 1998 and before that in 1973, as well as during/after the Civil War. The President might be subject to court proceedings, and 8theoretically* could be indicted (there’s no precedent for indictment), but the practicality is impeachment and removal, and for good reason.
I suppose a case could be made that a President could be tried in a state court, although the Civil War probably answered that question.