Alright, let's work through 9645 times 9421 step by step
9645 × 9421 = 9421 × (9645)
+ 9421 × 5 that is equal 47105
+ 9421 × 40 producing 376840
+ 9421 × 600 yielding 5652600
+ 9421 × 9000 giving us 84789000

= 90865545
