In the following URL features TAB, it is written as 4.
P.S. Reading VisonZ-san's suggestion, I realized that I should have mentioned that
although as the device family, PSoC 4 BLE has 4 Opamps, the number of available OpAmps
may vary depending on the package, usage of pins and resources in your design.
This is generally stated as "You mileage may vary".
Create a PSoC Creator project based on the device you select, then Open View-->Resource Meter, you can find detailed resources list of this device.