1var x = Math.sqrt(num);

1var isSquare = function (n) {
2    return n > 0 && Math.sqrt(n) % 1 === 0;
3};

1console.log(Math.sqrt(4));     // 2
2console.log(Math.sqrt(16));    // 4
3console.log(Math.sqrt(64));    // 8
4console.log(Math.sqrt(100));   // 10

1let number = 16
2Math.sqrt(number);
3//output = 4

1let n = 64;
2let root = 5;
3Math.pow(n, 1/root);
4// output 2;