The term supersonic is used to describe a speed that is over the speed of sound (Mach 1). At a normal temperature like 70 degrees Fahrenheit (21.1 °C), the speed needed for something to be traveling at a faster than sound speed is about 344 m/s, 1,129 ft/s, 770 mph or 1,238 km/h. Speeds faster than 5 times the speed of sound are sometimes called hypersonic. Speeds where only some parts of the air around an object (like the propellor) reach supersonic speeds are called transonic (normally somewhere between Mach 0.8 and Mach 1.2).
It can be very hard to reach supersonic speeds, because drag increases a lot near these speeds. This slows a plane down. Dick Whitcomb invented a lot of ways to overcome drag and break the sound barrier.