Alright, let's work through 5256 times 402 step by step
5256 × 402 = 402 × (5256)
+ 402 × 6 giving us 2412
+ 402 × 50 giving us 20100
+ 402 × 200 giving us 80400
+ 402 × 5000 yielding 2010000

= 2112912
