1604 x 1604 = ?  Pick:
A) A)2572816
B) B)3624216
C) C)3624316
D) D)3625116
E) E)3625216
1604 x 1604 = (1604)2   = (1600 + 4)2   = (1600)2 + (4)2 + (2 x 1600 x 4)   = 2560000 + 16 + 12800.= 
<gadget id="calculator">2560000 + 16 + 12800.</gadget>
<output>2_572_816</output>
2572816.   2572816)
<result>A</result>
1604 x 1604 = ?