Installs mean the total number of installs in the whole lifetime of the app. Also it doesn't matter the device. What counts is the google account. So every inst

Installs mean the total number of installs in the whole lifetime of the app. Also it doesn't matter the device. What counts is the google account. So every install = 1 google account registered in Google Play Store. Also google requires to verify the account with an sms these days.