No problem, we've got 2621 and 6123 to multiply
2621 × 6123 = 6123 × (2621)
+ 6123 × 1 what gives us 6123
+ 6123 × 20 that is equal 122460
+ 6123 × 600 what gives us 3673800
+ 6123 × 2000 that equals 12246000

= 16048383
