yes it is a mahajanapada.
Lichchhavis were a republican mahajanapada and were ruled by a group elected by the common people.There were no king.
Sanskrit was the language of Greater India, Vedic India (same thing), and Greater Iran. It was the language of the Vedas. It was closely tied with its counterpart, Avestan, the official language of Greater Iran and the Avesta. Sanskrit is still spoken today in India, numbering in about 10,000 active, fluent speakers. It originated before the Mahajanapada times of Ancient India. It was first used for Vedic culture, which again, sprouted in Greater India (composite of today's North India, Pakistan, and Afghanistan).