50NL. Bet the river here?

[steve bates]

I dont know how to use a hand converter so here is a raw HH.
Do you think I should have bet the river?. I thought villian may have better trips than I.

Dealer: Hand #3790586114
Dealer: Player 1 posts the small blind of $0.25
Dealer: player 2 posts the big blind of $0.50
Dealer: You have been dealt [7c 7d]
Dealer: player 3 folds
Dealer: player 4 folds
Dealer: player 5 folds
Dealer: steven bates calls $0.50
Dealer: player 6 folds
Dealer: player 7 folds
Dealer: player 8 folds
Dealer: player 1 folds
Dealer: player 2 to $2
Dealer: steven bates calls $1.50
Dealer: The flop is [Kh Jc 4d]
Dealer: player 2 checks
Dealer: steven bates checks
Dealer: The turn is [7s]
Dealer: player 2 bets $2
Dealer: steven bates calls $2
Dealer: The river is [Ah]
Dealer: player 2 bets $4

Raise or just call?