The dryer is using our "standard" such cord. Think of a heavy three-wire 'zip cord.'
Dryers are usually on a 220v, 30 A circuit. Ranges are usually 40 to 60 amps in size.
No, the dryer receptacle was not attached to the wall. FWIW, it was tied into the range circuit, using a very nice 'flying splice', removing piece of conduit, and other niceties.