Hi Yogesh, no you do not need to publish to the Google Play Store. The submission requirements are listed below. They can also be found under the rules tab on the site.
- Include an Application built with the required developer tools and meets the above Application Requirements.
- Include a text description that should explain the features and functionality of your Application.
- Include a demonstration video of your Application. The video portion of the submission 3 minutes or less. It should show footage of the demo in action and must be publicly visible.
- Include a URL to the working and published project. The Application must be public.