6000 size problem

Hi there!
I am creating a simple game. And i have come to a major problem.
The game is about clicking on little “squares” and each square is a movie clip that will have his own code. I am worried since there are 6000 little squares. Lets say, mc_b_1, mc_b_2, mc_b3… mc_b6000. How can i give their names (instance name) without clicking in one by one to give their names? Is there anyway to avoid this “exciting” part?