"Trivia" is plural. "Trivium" is singular.
According to my teacher, while she was typing for her lesson plan she wrote the word "trivia" and little that she knew that it was plural so she searched the web for it and found that it is plural.
Thanks! nice trivia, always remember when it's more than one add "s" on the end of the word so it's "plurals", when it pertains to only one object then it's "ingular"