No problem, we've got 1644 and 8396 to multiply
1644 × 8396 = 8396 × (1644)
+ 8396 × 4 that results in 33584
+ 8396 × 40 that is equal 335840
+ 8396 × 600 what gives us 5037600
+ 8396 × 1000 that results in 8396000

= 13803024
