Torn number

torn-brute.js

var a, b, s;
for (var i=1000; i < 9999; i++) {
    s = Math.sqrt(i);
    if (s%1 == 0) {
        a = Number(i.toString().substring(0, 2));
        b = Number(i.toString().substring(2, 4));
        if ( a + b == s) {
            console.log(a, b);
        }
   }
}

/** output
20 25
30 25
98 1
**/