To reach prestige master you should've played for at least 6 days game playing.
Criteria for cheaters is mostly the insane amount of tac insert usage, like 8000 and 50% instakills from it.Also look for score per minute, if this is above 600 it's not possible especially when they suck in the games they play with you.
Most of these cheaters, suck at the game they have k/d's like 0,6.
No not 6 days omg no if you have 6 days played then you are a hacker! You have to have at least 9 or more.