Alright, let's work through 7644 times 1053 step by step
7644 × 1053 = 1053 × (7644)
+ 1053 × 4 giving us 4212
+ 1053 × 40 that is equal 42120
+ 1053 × 600 producing 631800
+ 1053 × 7000 that results in 7371000

= 8049132
