Why does an int cannot be converted to java.math.BigInteger error pop up?

Question

Java

When using the method, it gives an error int cannot be converted to java.math.BigInteger, although I have translated BigInteger into Integer

public static String oddity(BigInteger n) {
        int n2 = n.intValue();
        int count = 0;
        for(int i = 1; i <= n2; i++){
            if(n2 % i == 0){
                count++;
            }
        }
        if(count % 2 == 0){
            return "even";
        }
        return "odd";
    }

Answer 1

Apparently, because instead of BigInteger you shove it into the int method

Answer 2

and yes i tried that too, got the same error