Technically legally does the second amendment apply to prisoners?

They can bare arms simply by wearing short sleeve shirts. They don’t need a law to do that.

The 2nd Amendment applies to everyone with their rights intact. Some prisoners are given all their rights back after serving their sentences, some after completing parole, and some prisoners are forever alienated from their “inalienable” rights. It depends on the severity of the crime and the laws of each state.

Felons cannot generally purchase or own firearms unless they have been pardoned or records expunged. For violent crime I completely agree but not so much for other crimes.

You give up certain rights when you are incarcerated. Pretty sure this is one of them.

Unless you are a Mexican Drug Lord in a Mexican Prison then guns are ok.

Yes it does along with the rest of the Bill of Rights. Prisoners are allowed to vote for officials who will set them free, join marches protesting their imprisonment, publish newspapers describing prison conditions and may not have their jail cells searched without a warrant.