Having an account to use any social media is mandatory. You need access to an account to use that app certainly and can see other users. But if you do not have an account and want to view Instagram profiles then you should follow these tricks:
1. Type the Instagram URL on your web browser and add (/username) into the URL. There should be the username’s name instead of the username in the URL. And go for the search.
2. Use any third-party apps like Imginn and Dumpor to see the profiles. Enter the username in the search bar and hit the search button.