Prospects are the chances somebody has of doing well in future. Career prospects, poor prospects, improve his prospects.
In this sense it is plural only. A prospect in the singular is a different thing: a possible outcome, or in sport a young player expected to be good. In mining, to prospect is to search for minerals, and a prospect is a place worth digging.
1nounprospectsThe chances somebody has of doing well in future.
“With good grades and a degree, her job prospects are excellent.”
prospects is chances.