1.
several people; a few people
An approximate number of people, typically implying somewhere between two or three and about ten. A common way to express a small, indefinite number of people.
数人の友達と会った。
I met with a few friends.
教室に数人の生徒が残っていた。
Several students were still in the classroom.
事故現場には数人の目撃者がいたが、証言はそれぞれ異なっていた。
There were several eyewitnesses at the accident scene, but their testimonies differed.
The prefix 数～ means "several" or "a few" and combines with many counters: 数回 (several times), 数日 (several days), 数年 (several years), 数百 (several hundred). The range implied by 数～ is roughly 2–9, though context determines the perceived quantity. Related: 何人か (some number of people — similar but phrased as a question-based indefinite), 数名 (several people — more formal variant using 名).