is the series still running?
Yes, it is on its second run.
Introduction
The series premiered on November 10, 1969, to positive reviews, some controversy, and high viewership; it has aired on the U.S.'s national public television provider PBS since its debut, with its first run moving to premium channel HBO on January 16, 2016, then its sister streaming service HBO Max in 2020.

when did the first episode of sesame street air 10 November 1969. is it a series? Yes, an educational children's television series.
UNANSWERABLE Yes Yes, it started streaming on HBO Max in 2020.
Sesame Street Sesame Street
Introduction Introduction
The series premiered on November 10, 1969, to positive reviews, some controversy, and high viewership; it has aired on the U.S.'s national public television provider PBS since its debut, with its first run moving to premium channel HBO on January 16, 2016, then its sister streaming service HBO Max in 2020. it has aired on the U.S.'s national public television provider PBS since its debut, with its first run moving to premium channel HBO on January 16, 2016, then its sister streaming service HBO Max in 2020
wiki:11555686
Sesame Street [SEP] Introduction
The show was initially funded by government and private foundations but has become somewhat self-supporting due to revenues from licensing arrangements, international sales, and other media. By 2006, there were independently produced versions, or "co-productions", of "Sesame Street" broadcast in twenty countries. In 2001, there were over 120 million viewers of various international versions of "Sesame Street", and by the show's 40th anniversary in 2009, it was broadcast in more than 140 countries.