A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 413952 can be evenly divided by 1 2 3 4 6 7 8 11 12 14 16 21 22 24 28 32 33 42 44 48 49 56 64 66 77 84 88 96 98 112 128 132 147 154 168 176 192 196 224 231 256 264 294 308 336 352 384 392 448 462 528 539 588 616 672 704 768 784 896 924 1,056 1,078 1,176 1,232 1,344 1,408 1,568 1,617 1,792 1,848 2,112 2,156 2,352 2,464 2,688 2,816 3,136 3,234 3,696 4,224 4,312 4,704 4,928 5,376 6,272 6,468 7,392 8,448 8,624 9,408 9,856 12,544 12,936 14,784 17,248 18,816 19,712 25,872 29,568 34,496 37,632 51,744 59,136 68,992 103,488 137,984 206,976 and 413,952, with no remainder.
Since 413,952 cannot be divided by just 1 and 413,952, it is not a prime number.