My answer is 'yes and no' )
Distinguishing between 'nabi' and 'rasool' - rasool are sent to all peoples and have 'knowledge of the book', whereas 'nabi' bring 'the book'.
Logically, all Nabi are rasool, but not all rasool are nabi. Thus "Mohammad is 'A' messenger of God, and the 'Seal' of the Nabi." shows he is the last Nabi, but one of many and not necessarily the last of the messengers.
Sorry about the lack of references, but years ago I went through quraan and listed every reference regarding 'Nabi' and 'Rasool', and made above conclusion. You can do the same!
Properties of rasool were A & B (forgotten details - one was 'knowledge of the book'
Properties of Nabi were A & B & C (forgotten details - one was 'bring the book'
Fred has A & B - therefore he is a rasool, but cannot be a Nabi because he lacks C
Joe has A & B & C - therefore he is a nabi, and also a rasool since he obviously has A & B
Modify Hmmm! ) RasulHamza's quote of 5725 above has just put me in doubt of my original characteristaion of Nabi/Rasul!!! Oh well - back to the drawingboard for a re-assesment. Doesn't alter my opinion about 'rasool to all peoples' meaning including modern times vs 'khatam un-nabi' meaning no more 'nabi's, though )!