According to JK Rowling he is, though it is not explicitly stated in the books or movies.
The actors who played him were Richard Harris and then Michael Gambon after Harris died. Neither of these actors are gay.
The character, Albus Dumbledore, in "Harry Potter" is gay. The actor, Michael Gambon, is not.
Not that we know of. By the way, the author has stated (outside the books, in interviews), that Dumbledore was gay.
J.K. Rowling appeared in an interview, announcing that Albus was indeed. However, there are no indications of it in the books or the movies, not at all. Rowling most likely added the idea for commercial reasons. It does not add to or take away from Dumbledore's character.
Sir Ian McKellan, who played the role of Gandalf in the films, has publicly announced that he is gay.
The author of the Harry Potter series, J.K. Rowling, announced that information. Albus Dumbledore was in love with a friend from his teenager years, Gellert Grindelwald. These feelings were not returned. In 1945, Dumbledore duelled Grindelwald and defeated him after he became a dark lord. Grindelwald was then the master of the Elder wand and after his defeat, Dumbledore became the master.
Yes, J.K. Rowling, the author of the Harry Potter series, confirmed that Albus Dumbledore, the headmaster of Hogwarts, was gay. This aspect of his character was not explicitly mentioned in the books, but Rowling revealed it in an interview after the series was completed.
Amaranthus albus was created in 1759.
Albus Dumbledore was created in 1997.
Asphodelus albus was created in 1799.
Monopterus albus was created in 1793.
Loxechinus albus was created in 1782.
Severus Snape used a killing curse on Albus Dumbledore.