That is used as a conversion factor between mass and energy.
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Not a "number." Energy is the speed of light squared times mass, so E = mc2.
The speed of light [3.0 x 108ms-1]
Energy equals mass multiplied by the speed of light squared
E stands for energy, M for mass, and C squared for the speed of light squared.
E=MC2 means that energy is equal to mass times the speed of light squared E=Energy M=Mass C=Speed of Light E+MC2 mean Energy+(Mass*Speed of Light)2 (squared) (This is using Albert Einstein's theory of what M,C and E means.