Sump pumps use a motor to pump the water out actively. That means when there’s enough water for it to be active, you’ll hear that motor running. Ideally, you do want it to be relatively quiet, but all sump pumps have a distinctive noise.
If you don’t hear the sump pump working, that may mean the pump’s lost power entirely. If the whole home hasn’t lost power, go through the other options to see whether you can restore power to the pump. Otherwise, you might need to talk to an expert.
There’s a similar problem if you can hear your sump pump working, but it doesn’t seem to be making an impact on the level of water in the basement. If this is the case, the motor may not be working properly anymore.