Project Problem 3: Largest prime factor

The prime factors of 13195 are 5, 7, 13 and 29.

What is the largest prime factor of the number 600851475143 ?

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Solution:

public class Problem_3{
    
    public static void main(String[] args){
        
        long a=600851475143l;
        long prime=0;
        
        for(long i=1l;i<a;a++){
            long temp=0l;
            if(a%i==0){
                if(isPrime(i)){
                    System.out.println("Prime factor is "+i);
                }
            }
        }
    }
    
    static boolean isPrime(long a){
        for(long i=2l;i<a;i++){
            if(a%i==0)
                return false;
        }
        
        return true;
    }
    
}