Hi there this is my code take it and learn it

public class Main {

    public static void main(String[] args) {

        getLargestPrime(1);
    }

    public static int getLargestPrime(int number){

        if (number <= 1){
            return -1;
        }

        int biggest = 0;
        for (int i = 2; i <= number; i ++){
            if (number % i == 0){
                int squareR = (int) Math.sqrt(i);
                boolean isPrime = true;
                for (int j = 2; j <= squareR; j++){
                    if (i % j == 0){
                        isPrime = false;
                        break;
                    }
                }
                if (isPrime){
                    biggest = i;
                }
            }
        }
        System.out.println(biggest);
        return biggest;
    }
}