There are a few ways to check if Maven is installed on your computer:
1. Check the system environment variables:
Open the system environment variables dialog box (in Windows, go to Start > Control Panel > System > Advanced > Environment Variables). Look for a variable named M2_HOME or MAVEN_HOME. If either of these exists, then Maven is installed.
2. Check the Maven installation directory:
Another way to check is to look for the Maven installation directory. By default, Maven will be installed in the C:\\Program Files\\Apache\\maven directory. If this directory exists, then Maven is installed.
3. Check the maven version:
Open a command prompt and type the command mvn -v. If Maven is installed, you should see the version number displayed.