The standard unit of energy, be it e=mc^2 or anything else, is Joule.
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No. E=mc2 is a formula. Energy equals mass times the speed of light squared.
Take a mass of 1 gram. Convert it entirely to energy, and measure that energy. You will find that this energy is equal to the square of the speed of light.
There is no sum of e=mc2, it is an equation concerning matter and energy. e=mc2 stands for: Energy equals mass times the velocity of light squared. E = M C 2
No E just applies to energy
Mass-energy equivalence