No problem, we've got 1644 and 6861 to multiply
1644 × 6861 = 6861 × (1644)
+ 6861 × 4 that is equal 27444
+ 6861 × 40 producing 274440
+ 6861 × 600 that is equal 4116600
+ 6861 × 1000 giving us 6861000

= 11279484
