100 examples of classic Java programming exercises: Example 22: Determine whether a random integer is a prime number

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Java classic programming exercises, beginners can refer to learning

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Title description:

Determine whether a random integer is a prime number

Problem-solving ideas:

开根号循环

Code:

public class Main {
    
    
    public static void main(String[] args) {
    
    
        System.out.println(isPrime(2));
    }
    public static boolean isPrime(int n){
    
    
        for(int i=2;i<=Math.sqrt(n);i++){
    
    
            if(n%i==0){
    
    
                return false;
            }
        }
        return true;
    }
}