英语释义
1. any integer other than 0 or ± 1 that is not divisible without remainder by any other integers except ± 1 and ± the integer itself
2. a number (such as 2, 3, or 5) that can only be exactly divided by itself and by 1
3. a number (as 2, 3, or 5) that results in a whole number from division only when it is divided by itself or by 1