Is this a bluffing situation?

[brian8065]

Villain is 28/6. This is his first attempt to steal blinds.


PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($67.95)
Button :#A500AF(Villain)/ ($49.25)
SB ($109.90)
Hero ($78.45)
UTG ($31.05)
UTG+1 ($25.30)
MP1 ($43.35)
MP2 ($32.30)

Preflop: Hero is BB with 3[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Button :#A500AF(Villain)/ raises to $1.75</font>, SB calls $1.50, Hero calls $1.25.

Flop: ($5.25) 4[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">Villain bets $3.5</font>, SB folds, Hero calls $3.50.

Turn: ($12.25) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Villain bets $7</font>, Hero calls $7.

River: ($26.25) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Villain bets $17</font>,

Is this a bluffing situation. The reason I ask is what hand would you raise with pre-flop, and all the way, and not just check it on the river?