No problem, we've got 1638 and 2141 to multiply
1638 × 2141 = 2141 × (1638)
+ 2141 × 8 what gives us 17128
+ 2141 × 30 that is equal 64230
+ 2141 × 600 what gives us 1284600
+ 2141 × 1000 that equals 2141000

= 3506958
