You left out one essential piece of information needed to calculate the power, and that is the rotational speed.  So here are a the power requirements for a few appropriate speeds:
    60 rpm    1,400 W
    50 rpm    936 W
    40 rpm    599 W
    30 rpm    337 W
The viscous power number for the impeller is 312.  Viscous power number is Power divided by all the following (Viscosity times Rotational Speed squared times Impeller Diameter cubed).  Of course the units of the variables must be consistent to obtain a dimensionless relationship.

The answers by this expert are based on the best available interpretation of the information provided.  The consequences of the application of this information are the responsibility of the user.  If clarification is needed, please submit a further question.