Is master chief noble six

Answer 1

no noble 6 is not Master Chief as he/she died at the end.

If you play the level lone wolf and watch it all halsey will say " if you only lived to see it".
No, Noble Six is a spartan III who dies on Reach following the credits of the game, where Master Chief is a spartan II who is already aboard the Pillar of Autumn upon Noble Six's arrival at Azod.

Answer 2

No he is not. 2 reasons. 1,noble six dies on reach and 2, on the level pillar of autumn when the ship takes off turn to the right and you see master chief in the cyro tomb.