How to verify is Magento software installed already

Solution :

• To determine if the Magento software is installed already, you can access the Magento Admin (administration console) or storefront using a web browser.
• Then open a web browser and go to the URL you were provided. Some examples follow:

http://www.example.com/magento2/admin
https://www.example.com/admin
http://www.example.com

• If a 404 (Not Found) error displays, Magento probably isn’t installed. You should confirm that with your system administrator or hosting provider.

• If Magento is installed, you should see something like the following after you log in:
  Magento Admin:
  
  Magento storefront: