Error: Could not find or load main class (MAC)

Question

I'm following a tutorial on beginning java and trying to run the following:

    package Examples;
public class Squares {
    public static void main(String[] args) {
        // Use a Scanner to read from standard in 
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        int num = 0;
        System.out.print("Please enter a number: ");
        num = scanner.nextInt();
        scanner.close();
    }
}

I'm able to compile it in a folder within a folder on my desktop (learn-java1/ch03/Examples) and create a Squares.class file within the same folder.

But when I try to run it, I get the error: "Could not find or load main class"

I've tried running the following with no success:

java Squares

java -cp . Squares

Any help would be appreciated, thanks!