.25/.50 lo/8, payoff this river?

[sfgiants]

Just sat down, no reads.

PokerStars 0.25/0.50 Omaha/8 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with 2[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, MP2 calls, <font color="#666666">2 folds</font>, Button calls, SB completes, Hero checks.

Flop: (5 SB) 9[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP1 calls, MP2 calls, Button calls, SB folds.

Turn: (4.50 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 folds, MP2 calls, Button folds.

River: (6.50 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP2 bets</font>, Hero ???.

Final Pot: 8.50 BB

Fold or call on river? Should I have gone for a check-raise earlier in the hand?