Alright, let's work through 1689 times 921 step by step
1689 × 921 = 921 × (1689)
+ 921 × 9 producing 8289
+ 921 × 80 which equals 73680
+ 921 × 600 giving us 552600
+ 921 × 1000 resulting in 921000

= 1555569
