What does the HP/kW power rating on the specification sticker of a pump mean?
3-phase 415V, 4.7A is about 3kVA, so the whole thing could not be above 3kW electrical.
(3-phase 415V electrical grid is in fact 3 x 230V and 415V is between phases, and you should multiply 3 x 230V x 4.7A in order to get VA power)
The plate says 2.2kW, so the power factor is ~0.73 - pretty much normal for this type of appliance.
The efficiency is the ratio between the pumping power and the electrical power. Your pumping power is 2.2kW * 0.4 = 880W
If you pump water at 26.7m head, the water will flow at about 3.3 liter per second to make these 880W.
The plate capacity range says 2.5-4.5 liter per second. It relates to pumping with different water head.
Everything fits, doesn't it?
Edit: some numbers wrong, fixing
Edit2:
HP (horsepower) in this context is equal to 0.735kW, so 2.2kW are 3.0HP within the 2-digit accuracy