Alright, let's work through 7451 times 2164 step by step
7451 × 2164 = 2164 × (7451)
+ 2164 × 1 yielding 2164
+ 2164 × 50 which equals 108200
+ 2164 × 400 that is equal 865600
+ 2164 × 7000 that is equal 15148000

= 16123964
