[Cooker]

I think this hand is too junky to play a multiway pot preflop. If the A is suited or make the 9 a J and things change some.

I agree with Buzz, take a chance at raising the turn. Someone may have called with their non-nut lows hoping to show them down cheap.

The river seems to depend on reads a fair amount. The nuts both ways require a 4, and there are only 4 fours and 5 players in, so someone almost certainly has to be getting nothing.

I think this is somewhat a judgement call, but I would probably just call as it seems to me that BB probably has the nuts (probably high) and UTG and MP3 also probably have the nuts to cold call (UTG is still calling 1.5 BB, both probably have A4 but if one has 54 you are looking good). That leaves SB most likely to have nothing and I wouldn't want to drive him out. If you have a read that he will call 2 more BB with a likely cap coming with A5, then by all means raise. Also, if MP3 could cold call 2 BB with less than the nuts then raise.