Can dark matter be explained by the supermassive black holes found in almost every galaxy?

Supermassive black holes have the mass of millions if not billions of stars and they are found at the center of almost all the galaxies.

These sentences are quoted from the articles that follow:
“Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies…”
“Scientist believe that most galaxies, certainly all the spiral ones, have such supermassive black holes in the center….”

Have a look at the following interesting articles:-
wikipedia
space telescope. org
space telescope. org 2
NASA
daily galaxy