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JavaScript

var generalCellAmount=prompt("General cell amount is ...", "");
var columnCellAmount = function(generalCellAmount){return Math.floor(Math.sqrt(generalCellAmount))};
//To get the amount of cells in every side of square, I am getting a square root of general cell amount.

alert(columnCellAmount(generalCellAmount));

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JSFiddle - React, Tailwind, and code Playground

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