Alright, let's work through 1521 times 1725 step by step
1521 × 1725 = 1725 × (1521)
+ 1725 × 1 giving us 1725
+ 1725 × 20 that is equal 34500
+ 1725 × 500 which equals 862500
+ 1725 × 1000 that results in 1725000

= 2623725
