No problem, we've got 5623 and 5521 to multiply
5623 × 5521 = 5521 × (5623)
+ 5521 × 3 what gives us 16563
+ 5521 × 20 that results in 110420
+ 5521 × 600 that is equal 3312600
+ 5521 × 5000 resulting in 27605000

= 31044583
