Alright, let's work through 5355 times 5391 step by step
5355 × 5391 = 5391 × (5355)
+ 5391 × 5 which equals 26955
+ 5391 × 50 which equals 269550
+ 5391 × 300 that is equal 1617300
+ 5391 × 5000 producing 26955000

= 28868805
