No problem, we've got 5625 and 3651 to multiply
5625 × 3651 = 3651 × (5625)
+ 3651 × 5 what gives us 18255
+ 3651 × 20 that is equal 73020
+ 3651 × 600 that results in 2190600
+ 3651 × 5000 giving us 18255000

= 20536875
