How many times more energy must be transferred into a kilogram of glass than a kilogram of silver to raise their temperatures by the same amount?

For window glass, about 3.5 times as much. The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

The specific heat of glass is 0.20 (kcal/kg °C)

The specific heat of silver is 0.0558

0.2/0.0558=3.58423