No problem, we've got 1284 and 1643 to multiply
1284 × 1643 = 1643 × (1284)
+ 1643 × 4 giving us 6572
+ 1643 × 80 what gives us 131440
+ 1643 × 200 giving us 328600
+ 1643 × 1000 that results in 1643000

= 2109612
