Java Big numbers

PrimeBigNumber.java

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+import java.io.*;
+import java.math.*;
+import java.security.*;
+import java.text.*;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.*;
+
+public class PrimeBigNumber {
+
+
+
+    private static final Scanner scanner = new Scanner(System.in);
+
+    public static void main(String[] args) 
+    {
+        String n = scanner.nextLine();
+        BigInteger bn=new BigInteger(n);
+        if(bn.isProbablePrime(1))
+        {
+            System.out.println("prime");
+        }
+        else
+        {
+            System.out.println("not prime"); 
+        }
+    scanner.close();
+}
+
+}

javaBigInteger.java

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+import java.io.*; 
+import java.util.*; 
+import java.text.*; 
+import java.math.*; 
+import java.util.regex.*;
+
+public class javaBigInteger {
+
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        BigInteger b1=new BigInteger(sc.next());
+        BigInteger b2=new BigInteger(sc.next());
+
+        BigInteger b3,b4;
+        b3=b1.add(b2);
+        b4=b1.multiply(b2);
+
+        System.out.println(b3);
+        System.out.println(b4);
+    }
+}