Answer / Rahul Mishra

In Java, here's a simple program that checks if a number is prime:
```
import java.util.Scanner;
public class PrimeChecker {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number to check for primality:");
int num = sc.nextInt();
if (num <= 1) {
System.out.println(num + " is not prime.");
} else {
for (int i = 2; i < num; i++) {
if (num % i == 0) {
System.out.println(num + " is not prime.");
return;
}
}
System.out.println(num + " is prime.");
}
}
}
```

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