The DC resistance is only a small part of the motor's useful parameters. It will give you an idea of what the initial inrush or "stall" current will be.
Don't allow the shaft to turn while measuring the resistance.
The more important value is the back-EMF when the motor is running. To measure this you need to know the RPM that the motor is turning when you measured it. One way is to turn it at a known RPM (maybe with a battery drill or something) and measure the voltage it produces. That will give you RPM per volt, which is extremely useful when you want to know how fast it will turn when powered by a specific voltage.
Depending on the size of the motor, you can generate some dangerous voltages this way. Don't hold the test leads on the pins by hand. Use alligator clips or more permanent connectors. You also have to keep your fingers and loose clothing away from the rotating parts. Take the extra time to set it up properly, maybe with a wooden jig clamped in a bench vise.