First go into your application folder and check the following files:
Drupal 8 & Drupal 9
grep VERSION core/lib/Drupal.php
Drupal 7
grep VERSION includes/bootstrap.inc
Drupal 6 and older
grep VERSION modules/system/system.module
First go into your application folder and check the following files:
grep VERSION core/lib/Drupal.phpgrep VERSION includes/bootstrap.incgrep VERSION modules/system/system.module