No it's like right next to the sun
Nobody. No human ever set foot on the planet Mercury.
It can be sometimes, but Venus can be closer than Mercury ever can; Mercury is only the closest planet to Earth when Venus is on the opposite side of the Sun from Mercury and Earth, and maybe not even then (depending on exactly where Mars is).
The small planet of Mercury has almost no atmosphere. If there was ever an atmosphere on that planet, the sun likely burned it off.
No spacecraft has ever landed on Mercury. A couple have orbited around the planet.
No because it is to close to the sun with rapid temperatures.
No one knows for sure yet. Some day Mercury can become a drawf planet because of how small it is. If Mercury does become a drawf planet Mars is probably next.
Mercury is a planet.
Mercury is not a dwarf planet. It is a planet.
What snow planet?
Mercury is itself a planet - it did not come from a planet!
Mercury is the planet closest to the sun.