Longer answer....

The PROP not the motor, electronics, battery, etc... determines how much power will attempt to be drawn from your electronics.

The wrong prop will damage or destroy any setup, or cause your configuration to perform poorly.

With electric planes you start by taking the all-up expected weight of the plane, adding a factor, then working from that to determine the prop size, and subsquently motor, esc and battery to use.

As just pointed out, the manufacturers of RTF and many ARF planes have already done most of the work for you with their specifications, but of course what they concieve of is usually not what the purchaser may expect.