I'm a bit new to the whole GIS world, and though I am making great headway drawing polygons and such in Bing Maps, I am currently stuck. In our SQL spatial data, I came across MULTIPOLYGON data, where all the coordinate values are very large numbers (6 digits and 7 digits for what should be latitude and longitude, before the decimal). I found an SQL method to dismantle the multi-polygon into several polygons, but those large values do not work in Bing Maps nor Google Maps. So I've been searching for an algorithm to convert those large numbers down to what I have perceived as regular latitude/longitude numbers, such as 45.19167 -93.58328 (which does work on online maps).
With that said, could somebody please either show me or point me in a great direction to learning how to convert 631456.83, 3816200.79 to something I can use online. I know the coordinates fall somewhere in Arizona.