Can $E=mc^2$ be also expressed as $mc=\sqrt E$?

Question

As the title suggests, can the equation $E=mc^2$ be also expressed as $mc=\sqrt{E}$?

Answer 1

No, if you square root both sides of the equation, then all of $mc$ must be square rooted $(ie. \sqrt{mc^2} = \sqrt {E}$).

So then simplifying:

$$ c\sqrt{m} = \sqrt {E}$$

Answer 2

No, because $mc^2$ on the right-hand side should be read as $m\cdot(c^2)$.

Answer 3

No.Even the units doesn't match ,Left hand side -> $kg\cdot m/s^2$ and right hand side is $(kg\cdot m)^{1/2} /s$