No problem, we've got 1641 and 7089 to multiply
1641 × 7089 = 7089 × (1641)
+ 7089 × 1 that is equal 7089
+ 7089 × 40 that equals 283560
+ 7089 × 600 what gives us 4253400
+ 7089 × 1000 that results in 7089000

= 11633049
