To my knowledge, there is no lucky number. I have seen a car with a very lucky number so selected by the owner falling into a canal and killing himself and some of his children.
Your Root Number(Moolank) is 2 , Your Destiny Number(Bhagyank) is 4. You can choose a number for your car number plate whose sum of the digits adds up to 2 as it is compatible with your destiny number and root number.