The word cumpleanos is oxytone because the tonic syllable is the penultimate syllable. It does not have a graphic accent because it is paroxytone and ends in 'n', 's' or vowel. The word cumpleanos has one hiatus ea. ... cumpleanos has 4 syllables.

What does Cumplianos?

Noun. cumpleaños m (plural cumpleaños) birthday.

Is cumpleaños plural?

Most words in Spanish ending in -s don't have a different form in plural, so "birthday"="cumpleaños" and "birthdays"="cumpleaños" too.