Alright, let's work through 2620 times 5903 step by step
2620 × 5903 = 5903 × (2620)
+ 5903 × 0 that is equal 0
+ 5903 × 20 that equals 118060
+ 5903 × 600 that equals 3541800
+ 5903 × 2000 which equals 11806000

= 15465860
