yes the gyro puts out a number proportional to its full scale reading. You need to check the spec sheet for the part, its on the
www.analog.com website.
depending on whether you scale the input signal or not, you may want to spin the robot (or the sensor) at a fixed rate and measure the actual signal the sensor puts out.
or if you are integrating the gyro output to get compass heading, turn the robot exactly 90 degrees and see what the change in your accumulated heading number is. Then you will know how many 'counts' equals one degree.