No problem, we've got 1631 and 5125 to multiply
1631 × 5125 = 5125 × (1631)
+ 5125 × 1 what gives us 5125
+ 5125 × 30 that results in 153750
+ 5125 × 600 giving us 3075000
+ 5125 × 1000 yielding 5125000

= 8358875
