// Perfect squares are: 1(1*1), 4(2*2), 9(3*3), 16(4*4), 25(5*5), 36(6*6)...
function is_perfect_square(n) {
const sqr = Math.sqrt(n);
return sqr == Math.floor(sqr);
}
if (is_perfect_square(36))
console.log("Yes");
else
console.log("No");
if (is_perfect_square(20))
console.log("Yes");
else
console.log("No");
/*
run:
Yes
No
*/