how to get the square root in js

Math.sqrt(9);
 

var x = Math.sqrt(num);

Math.sqrt(9);
 //return square root of number

let n = 64;
let root = 6;
Math.pow(n, 1/root);
//output 2;

let n = 64;
let root = 6;
Math.pow(n, 1/root);
// output 2;

let n = 64;
let root = 5;
Math.pow(n, 1/root);
// output 2;

sqrt("random number, do not put quotes"); //square root