So Hamilton doesn't get the number 1?
He can I believe he chose not to. Nevermind found article that explains it.
Below is nicked from ESPN
Lewis Hamilton plans to break from tradition next season and retain the number 44 on his Mercedes, rather than adopt number one for his title defence.
At the start of the 2014 season F1 drivers picked numbers to remain with them for the remainder of their careers, with Hamilton choosing the number 44 with which he won his first karting title. Sebastian Vettel picked number five at the start of the year but drove with number one on his Red Bull because he was the defending champion, with regulations stating he will switch to his career choice next season at Ferrari.
But newly-crowned 2014 world champion Hamilton, who has the number 44 tattooed behind his right ear, says his current choice means more to him.
"Forty-four has always been my number, ever since I started [racing]," Hamilton said. "I won my first championship on number 44. I'm going to work very hard to ask the team if I can keep 44 on my car next year. Number one is a great thing but I will always know I'm number one. Forty-four is my favourite number so I want to keep it on the car."
Other motor racing championships, such as Moto GP and IndyCar, often have competitors sticking with their career number when defending a championship. Hamilton says he would not need a change of number on his car for other drivers to know he's the defending champion.
"It doesn't make any difference. I'll still be 44 but underlying that the drivers will know I'm number one."
Read more at
http://en.espnf1.com/mercedes/motorsport/story/186125.html#dJ46WM7jYOPA6A7K.99