Do I have an iCloud password and if so, how would I update it?

Hello debrapal,

Yes, you definitely have an iCloud account with a password. This is an essential part to Apples Eco System and necessary to download Apps in the App Store. You can Reset your password using the link below.

The following Apple Support documents may help resolve your issue:

Reset Password -> https://iforgot.apple.com/password/verify/appleid

Forgot Apple ID -> https://iforgot.apple.com/appleid

If those did not help, Contact Apple Support:

-> Contact Apple for help with Apple ID account security - Apple Support

The link I provided earlier allows you to reset it: https://iforgot.apple.com/password/verify/appleid

Otherwise, you can also change it using your iMac:

Click the Apple logo (top left) > Select "System Preferences" > Click on the "Apple ID" logo. In the left side, select "Password & Security".