No problem, we've got 1645 and 3631 to multiply
1645 × 3631 = 3631 × (1645)
+ 3631 × 5 that is equal 18155
+ 3631 × 40 producing 145240
+ 3631 × 600 yielding 2178600
+ 3631 × 1000 what gives us 3631000

= 5972995
