22. Java judges whether a number is a quality number. [ZTE test]

Prime number. In a natural number, there is only one and its two approximate numbers called prime numbers. That is to say, in a natural number, apart from 1 and the integer itself, the number cannot be divisible by other natural numbers. This is called a prime number.

Public class swaptest {public static Boolean isprimer (INT number) {If (number <= 1) return false; // judgeAlgorithm, I does not need to loop to N for (INT I = 2; I <math. SQRT (number); ++ I) {If (Number % I = 0) return false;} system. out. println ("true"); Return true;} public static void main (string [] ARGs) {isprimer (2 );}}