866-415-4111

Warning! This is an IRS & Tech Support Scam number!

A call back answerd as "Wire Es Investagashun dapartmint"...so, yeah...scammers!
A websearch also shows this number is used in Tech Support scam popups.

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IRS Scam

The IRS doesn't initiate contact with taxpayers by email, text messages or social media channels to request personal or financial information. In addition, IRS does not threaten taxpayers with lawsuits, imprisonment or other enforcement action. Recognizing these telltale signs of a phishing or tax scam could save you from becoming a victim.
See: How to know it’s really the IRS calling or knocking on your door

You can make a report about an IRS Scam call:

Contact the Treasury Inspector General for Tax Administration to report a phone scam. Use their “IRS Impersonation Scam Reporting” web page. You can also call 800-366-4484.

Report phone scams to the Federal Trade Commission. Use the “FTC Complaint Assistant” on FTC.gov. Please add "IRS Telephone Scam" in the notes.

The IRS Collection Process:
https://www.irs.gov/pub/irs-pdf/p594.pdf

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Tech Support Pop Up scam:

Web Browsers DO NOT have the ability to determine and warn you your computer has an error. They can only warn you about a potential malicious website you are about to visit. A Browser is software that allows you to surf the Internet, not diagnose a computer or phone.

How would the pop up message know who to call unless the number was put there by the scammers who created the pop up?

Most popups are generated from an Ad on an unsuspecting website and you can just close the tab/window. If it will not close or opens new windows/tabs, try editing the address bar {put Google.com} and hit enter or you can End Task the Browser {Ctrl+Shift+Esc}.
They can be removed by clearing the Cache and History after restarting the Browser. You should also have an Ad Blocker turned on. If your Browser doesn't have one built-in, you might look to see if it supports a Browser Extension Ad Blocker.
If that didn't work and your still getting pop ups, you might have a PUP (Potentially Unwanted Program) that triggers a popup window.
You can goto https://www.malwarebytes.com/mwb-download/ and get the free trial to remove it or you can try this site to help remove the PUP:
https://malwaretips.com/blogs/remove-tech-support-scam-popups/

Beware of websites claiming "Remove 'this number' pop up virus", as many are downloads for adware cleaners or malware. Only trust reputable Malware/Anti-Virus sites that use Official products from the Official website.