Java solution :

public static int squares(int a, int b) {
    int startVal = (int)Math.sqrt(a);
    int endVal = (int)Math.sqrt(b);
    int sqrtcount = 0;

    for(int i=startVal ; i<=endVal ; i++) {
        int square = i*i;
        if(square>=a && square<=b) {
            sqrtcount++;
        }
    }

    return sqrtcount;
}