Let's calculate 6398 x 2003
6398 × 2003 = 2003 × (6398)
+ 2003 × 8 what gives us 16024
+ 2003 × 90 resulting in 180270
+ 2003 × 300 which equals 600900
+ 2003 × 6000 resulting in 12018000

= 12815194
