I don't know who came up with E = mc, but Einstein came up with E = mc2.
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He did not use any databases to come up with E=mc^2.
No. E = mc2 is not the same as E = (mc)2 which is what the question suggests. Also, if you know E, why do you need to square anything to "get" E?
the person who came up with that is pythagoris, and it is called the pythagrian theorem.
Euler
It is believed that Einstein was the one who made up the equation yet there is much speculation surrounding it validity and many have tried to prove him wrong.