There are two modes: one single player and the other is multiplayer. So yes, it is.
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It is both types of game, now with multiplayer dlc
No, Portal is for PC only. Portal 2 is for PS3,Xbox 360,and PC. Plus it would suck on PSP.
Portal 2 comes out on April 18, 2011.
You cannot get a demo for Portal 2, and if there were it would be on Steam as Valve (the creators of Portal 2) distribute all their games there exclusively. However, if you haven't played the first Portal game I would recommend it, and if you like it you'll be sure to love Portal 2!
No Portal 2 is for PC, Xbox 360 and PS3.