Is multi-colorful a word? Or is the correct word multi-colored?
According to Collins Dictionary, the prefix multi- is defined as:
many or much
more than one
Whereas colorful is defined as:
full of color or of vivid colors
full of interest or variety; vivid
Additionally, it is worthwhile to note that multicolored is defined as:
having many colors
Thus, based on the above definitions, the "word" multicolorful does not appear like a proper word. However, multicolored is.
Hope this is helpful!