But wait: is it divisible by $9$ always? No, as $105 = 3 \cdot 5 \cdot 7$, not divisible by 9. - AMAZONAWS
Does Every Number Divisible by 9 Always Work? No—Take 105, Which Proves the Point!
Mar 06, 2026
Does Every Number Divisible by 9 Always Work? No—Take 105, Which Proves the Point!