The very first step is to open the page source by doing right click and then View Page Source.
Then search for jquery.js or most likely jquery.min.js. The browser will tell you how many times the keyword was found on that page. The jQuery version that ships with WordPress will be loaded from /wp-includes/ folder and will be followed by a version parameter which is usually the WordPress version.
/wp-includes/js/jquery/jquery.min.js?ver=6.5.1
If there are multiple jquery versions the other ones are probably loaded from a CDN (Content Delivery Network).
https://code.jquery.com/jquery-3.7.1.min.js
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js
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