A standard six-sided fair die is rolled four times. The probability that the product of all four numbers rolled is a perfect square is \frac{m}{n}, where m and n are relatively prime positive integers. Find m+n.
A standard six-sided fair die is rolled four times. The probability that the product of all four numbers rolled is a perfect square is \frac{m}{n}, where m and n are relatively prime positive integers. Find m+n.