From the press release:
At full power, the rocket generated 855,000 pounds of force at sea level. In vacuum, the thrust increases to approximately one million pounds or four times the maximum thrust of a 747 aircraft. The test consumed over half a million pounds of propellant. All nine engines fired for 160 seconds, then two engines were shut down to limit the acceleration and the remaining seven engines continued firing for 18 more seconds, as would occur in a typical climb to orbit.
The Falcon 1 that launched into orbit in September used 1 of the Merlin 1C engines in its first stage. The Falcon 9, a heavy lift human rated launch vehicle, will use 9 of the Merlin 1C engines in its first stage. This was a test fire of that first stage.