Answer:
Via reading John Chapter 20 - for one - of the New Testament.
Perhaps, you may mean, also, in what way does it mean, "risen".
It is the testament of the New Testament that Jesus, as an immortal spirit that had overcome all, literally raised His body from the dead to become Immortal, both body and spirit - such that His spirit and body are now One for eternity, to rule and reign in glory, dominion and might forevermore, and that when this earth has completed its job of 'peopling', Jesus will return to take charge of His own Creation, as literally as you and I speaking to one another.
This was the very meaning of the fact that Mary and the disciples found the burial tomb empty and the two angels standing by who said to them: "Why seek ye the living among the dead? For He is risen."