Interest is divided into syllables like this: in-ter-est.
The word "interest" has two syllables: in-ter-est.
Three
There are three syllables like so: in-ter-est.
There are 4 syllables. In-ter-est-ed.
There are three syllables: lat-i-tude.
There are three syllables like so: sar-cas-tic.
There are three syllables like so: ter-ri-fy.
There are three syllables like so: rat-tle-snake.
There are three syllables like so: sci-en-tist.
There are three syllables in "computer": com-put-er.
There are three syllables in the word syllables.
There are three syllables: ear-li-est.