[GENERAL] Index not being used

[Ralph Smith]

I'm confused.  Shouldn't this index be used?
(It's running on v7.4.7)
airburst=> \d stats2
             Table "public.stats2"
  Column   |         Type          | Modifiers
-----------+-----------------------+-----------
lab       | character varying(30) |
name      | character varying(50) |
status    | character varying(40) |
eventtime | integer               |
username  | character varying(30) |
pkey      | character varying(60) |
Indexes:
    "stats2_etime_index" btree (eventtime)

airburst=> \d stats2_etime_index
Index "public.stats2_etime_index"
  Column   |  Type
-----------+---------
eventtime | integer
btree, for table "public.stats2"

airburst=> explain select count(*) from stats2 where eventtime >  
1167638400 ;
                              QUERY PLAN
-----------------------------------------------------------------------
Aggregate  (cost=185247.97..185247.97 rows=1 width=0)
   ->  Seq Scan on stats2  (cost=0.00..179622.45 rows=2250205 width=0)
         Filter: (eventtime > 1167638400)
(3 rows)

Thanks,
Ralph