RF Synthesizer Tuning Frequencies

I am using a Max2900 transmitter. This includes a frequency synthesizer that can be tuned in the 902-928 ISM band. It has 3 digital inputs to select the divide by ratio. How does this determine which frequency the transmitter is tuned at and what frequencies can this transmitter tune to based upon this?

frf = fref/4*divider

I am still confused. For instance one of the division values is 250. The fref is 14.56 MHz.

14.56Mhz/1000 ? Shouldnt it be in the 902-928 Band

You'll want to read the expression as commonly usual
frf = (fref/4)*divider