Multiplying 4000000 * 4000000 gives you 1.6e13 which is a scientific way of saying 1.6 times 10 to the 13th power or 1.6 multiplied by 10,000,000,000,000. When multiplkying numbers of this type (a number followed by a bunch of zeros), you can just multiply the beginning non zero part (4 * 4 = 16) and follow it with the total number of zeros (there are 12 zeros giving you the same number as above: 16,000,000,000,000.
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