When you have a default route as well as any other static route, you should see the # when the GW vlan is UP (at least 1 port UP). If the vlan is down, then you won't see the #.
To confirm if the route is being used you can check the "f" flag that means "Provided to FIB".
Example 1:
Ori Destination Gateway Mtr Flags VLAN Duration
s Default Route 10.10.0.181 1 -G---S-um---- Link1 0d:0h:1m:34s
#s Default Route 10.10.0.189 2 UG---S-um--f- Link2 0d:0h:1m:25s
Route with lower metric through vlan Link1 (metric 1) is down and the next best route will be used (with higher metric).
Example 2:
Ori Destination Gateway Mtr Flags VLAN Duration
#s Default Route 10.10.0.181 1 UG---S-um--f- Link1 0d:0h:12m:12s
#s Default Route 10.10.0.189 1 UG---S-um---- Link2 0d:0h:0m:5s
Both routes are UP, but the route with lower metric is being used. Again, you can confirm that based on the "f" flag.