MHB How can I get equal columns and rows from a total?

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I have a number of cells (say 10 cells) but that number is a variable.
I have the value of the variable but it's not a 'hard' number. We'll call the variable x.

I need to calculate how many columns I'll have if the columns and rows will be the same, or the columns will be 1 minus (floor) the number of rows.
If the variable x = 10 then the columns would be 3 and there would be 4 rows, the last row would only have a value in the first column.

How can I calculate for the number of columns I need given the variable x?
 
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Duh - floor(square root of x)
 

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