√(3.33&642,348)

Indeed, you will need to rewrite your question. Your questions has a mathematical error. In Maths, you can not put an ampersand in an equation!

Are you Romanian?

I do not understand what the '&' symbol means. 

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Nu înţeleg ce înseamnă simbolul "&".

I think "&" = "+"

$${\sqrt{{\mathtt{3.33}}{\mathtt{\,\small\textbf+\,}}{\mathtt{642.348}}}} = {\mathtt{25.410\: \!194\: \!804\: \!448\: \!076\: \!1}}$$

I think it means and