How many cm2 are there in 1m3?

Infinite, in theory. cm2 is a measurement of area, m3 is volume. If you had a 1m3 block, then the top face would be 1m x 1m, having 10000cm2, if you then sliced this layer off you would have another 10000cm2 below it, and so on. It depends how thinly you slice the block.