Let's calculate 2531 x 6421
2531 × 6421 = 6421 × (2531)
+ 6421 × 1 that results in 6421
+ 6421 × 30 resulting in 192630
+ 6421 × 500 what gives us 3210500
+ 6421 × 2000 producing 12842000

= 16251551
