Technically, yes, but there are a couple of issues with that.
1. A scanned image won't scale as well as vector graphics will no matter what software you use, so it will probably look really terrible when you blow it up to be a few feet on a side.
2. Sizing the image within CC2 to match the CC2 scale to the image scale can be tricky. Unfortunatly, the software doesn't have any way to know what scale your scanned image is supposed to be at, so you have to manually size it to be the right size in CC2. If you aren't worried about absolute accuracy, this works OK but the result will probably be off. See, the scaling commands in CC2 are tied to the CC2 internal grid. So you need to make sure that however wide five feet on your scanned map is will also be 5 feet in CC2 and then it can print it to scale as I mentioned in the previous message.
The good news is that it's pretty easy to crank out a quick dungeon map using the native tools in CC2 and even easier with the Dungeon Designer add on, which has various specialized tools and several sets of "geomorphs" you can use to crank out dungeons. I've been able to crank out a simple dungeon in less than half an hour complete with textured floors and a 5' foot grid overlay.
By the way, the software also tiles things for you if you want. Thus, if you have a map that might take up a sheet of paper two yards on a side if printed at 5' to the inch but you only have a printer that will print on letter sized paper, it can tile it onto a bunch of pieces of letter size paper automatically so you can just tape them together or tape them onto some poster board to assemble a big map. I plan to use this technique with my newest campaign setting to produce a large regional map that's a similar size to the ones that come with published settings.