No problem, we've got 1636 and 3904 to multiply
1636 × 3904 = 3904 × (1636)
+ 3904 × 6 giving us 23424
+ 3904 × 30 producing 117120
+ 3904 × 600 which equals 2342400
+ 3904 × 1000 that results in 3904000

= 6386944
