Alright, let's work through 8497 times 1621 step by step
8497 × 1621 = 1621 × (8497)
+ 1621 × 7 that results in 11347
+ 1621 × 90 that equals 145890
+ 1621 × 400 what gives us 648400
+ 1621 × 8000 that is equal 12968000

= 13773637
