Salamun Alaikum
Yes of course. Verse 66:3 is a clear verse that informs the reader that humans receive 'messages', 'information' or even 'inspirations' from God.
However, the Prophet received this 'inspiration' as a man, not in the capacity of a Prophet. If he received an inspiration for the purposes of religious guidance for the posterity of believers it would have appeared in the Quran. Please see verses 3:123-126 which were confirmed as arguably prophetic inspiration / information which has been preserved for posterity. Muhammad (pbuh) was a son, a man, a father, a husband, a leader, a spiritual leader and a PROPHET. He could make mistakes in the capacity as a man (66:1, 80:1), but never in the capacity as a Prophet with regards his 'wahi' for mankind. This was protected (53:3-4)
This 'inspiration', 'message' or 'manifestation of truth' in verse 66:3 would be no different in my opinion to the 'inspiration' acquired by the mother of Prophet Moses (pbuh) who was 'inspired' (Arabic: awhayna) to place her baby in the river. (28:7) She was not a Prophet, but received 'inspiration' in her capacity as a fearful mother.
In our own personal experiences, circumstances often reveal things to us where we may feel that we may have been 'shown' something or in some way 'aided'.
In a similar manner, all this verse confirms is that God does communicate and assist mankind in different ways, like the mother of Prophet Moses (pbuh).
Prophet Muhammad (pbuh) was no different and he too received such non Quranic 'assistance / wahi' to deal with his personal life.
I hope that helps.
Your brother in faith,
Joseph.