Alright, let's work through 6634 times 123 step by step
6634 × 123 = 123 × (6634)
+ 123 × 4 that is equal 492
+ 123 × 30 giving us 3690
+ 123 × 600 that equals 73800
+ 123 × 6000 which equals 738000

= 815982
