Alright, let's work through 5551 times 1509 step by step
5551 × 1509 = 1509 × (5551)
+ 1509 × 1 that results in 1509
+ 1509 × 50 resulting in 75450
+ 1509 × 500 resulting in 754500
+ 1509 × 5000 what gives us 7545000

= 8376459
