No problem, we've got 8406 and 1644 to multiply
8406 × 1644 = 1644 × (8406)
+ 1644 × 6 which equals 9864
+ 1644 × 00 resulting in 0
+ 1644 × 400 which equals 657600
+ 1644 × 8000 giving us 13152000

= 13819464
