Is this a millipede???

Yes, it is a polydesmid millipede, genus Sigmoria. Not sure of the species, although I've seen it in North Carolina. Sigmoria aberrans has red triangles on its segments and the yellow-banded sigmoria has yellow stripes which go all the way across the back.

Oh, wait. I though the yellow stripe down the middle was just glare, so it's a little different from the ones I've seen. Still probably Sigmoria, though.