A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2050464 can be evenly divided by 1 2 3 4 6 8 12 13 16 24 26 31 32 39 48 52 53 62 78 93 96 104 106 124 156 159 186 208 212 248 312 318 372 403 416 424 496 624 636 689 744 806 848 992 1,209 1,248 1,272 1,378 1,488 1,612 1,643 1,696 2,067 2,418 2,544 2,756 2,976 3,224 3,286 4,134 4,836 4,929 5,088 5,512 6,448 6,572 8,268 9,672 9,858 11,024 12,896 13,144 16,536 19,344 19,716 21,359 22,048 26,288 33,072 38,688 39,432 42,718 52,576 64,077 66,144 78,864 85,436 128,154 157,728 170,872 256,308 341,744 512,616 683,488 1,025,232 and 2,050,464, with no remainder.
Since 2,050,464 cannot be divided by just 1 and 2,050,464, it is not a prime number.