Hi Mary,

Khan Academy does not currently have a public telephone or support number. However, you can create a support ticket and an agent will get in contact with you.

Let me know if you have any further questions!

Also if you have a basic questions here and our support team will do our best to respond to the questions you have like navigating Khan Academy.

Is Khan Academy an actual school

No, Khan Academy is not a school.  Its courses are intended to supplement a curriculum, not replace it.  Khan Academy offers no certificates and no diplomas.