For each of our motors, there is a comprehensive propeller data chart that can be found by clicking on the link just above the motor specification chart. For the CM-2213/12, 2000Kv motor, that chart can be found at the following link.
This motor is rated for 30 amps of continuous current. When running on 11.1 volts with an HQ 7x4.5 prop, the motor pulls 29.88 amps of current, which is as big as you can use without exceeding the max current recommendation.
An APC 8x4.5-MR prop pulls 1.43 times as much current as the HQ 7x4.5, so if you tried to run this prop on the CM-2213/12 motor, it would try to pull 42.8 amps at full throttle and burn up the motor.
Likewise, a GemFan 8x4.5 prop pulls 1.67 times as much current as the HQ 7x4.5 prop, so if you try to run that prop, the motor would try to pull 49.8 amps at full throttle, and would quickly overheat and burn up.
If you had a very low pitch 8 inch prop, such as the T-Motor 8x2.7 model, then you might be able to keep the current down below 30 amps.
When using these motors on multirotor, they typically run at around 50% power, where they only pull about 1/3 of the full throttle current. Because of this, it is usually OK to run a prop that is a little bit larger than recommended, because full throttle seldom, if ever, gets used. However, you do need to be careful using too large of a prop because it will overheat if it is run too hard, and possible burn up if run at full throttle for more than a few seconds.