Alright, let's work through 4251 times 1553 step by step
4251 × 1553 = 1553 × (4251)
+ 1553 × 1 what gives us 1553
+ 1553 × 50 yielding 77650
+ 1553 × 200 resulting in 310600
+ 1553 × 4000 that equals 6212000

= 6601803
