It only doubles each time, and the Earth still can't cover it
A king once asked the servant who invented chess what he wanted as a reward. The servant said, "One grain of wheat on the first square, two on the next, four on the one after that — please fill all 64 squares that way." The king laughed and said, "What kind of wish is that?" Press the squares one at a time and find out.
The number of grains on each square is 2ⁿ⁻¹ (for the nth square). Each new square doesn't add to the number, it multiplies it — so it looks like nothing at first, then grows at a speed that is genuinely hard to picture.