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Yes you can choose weather or not you want to prestige or if you want to stay at level 70.
level 70...10th prestige
Prestige 14
Once you reach the prestige Level it will ask you
The best level is 15th Prestige level 50
The only way you can get to the next prestige is to reach level 70 and obtain all XP to Prestige.
When you reach the max level, you can prestige and you start over prestiged.
prestige is when you get to level 70+ and you want to start back at the begining but you keep your emblums
Next to your name, It will Show the level/rank/prestige sign
Level 70 on your 10th prestige.
type it into you tube and there will be a video of prestige badges and what prestige they are
267 times is the maximum times you can prestige on call of duty modern warfare 2, this takes on average 80 days of game play