A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2020032 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 64 72 84 96 108 112 126 144 167 168 189 192 216 224 252 288 334 336 378 432 448 501 504 576 668 672 756 864 1,002 1,008 1,169 1,336 1,344 1,503 1,512 1,728 2,004 2,016 2,338 2,672 3,006 3,024 3,507 4,008 4,032 4,509 4,676 5,344 6,012 6,048 7,014 8,016 9,018 9,352 10,521 10,688 12,024 12,096 14,028 16,032 18,036 18,704 21,042 24,048 28,056 31,563 32,064 36,072 37,408 42,084 48,096 56,112 63,126 72,144 74,816 84,168 96,192 112,224 126,252 144,288 168,336 224,448 252,504 288,576 336,672 505,008 673,344 1,010,016 and 2,020,032, with no remainder.
Since 2,020,032 cannot be divided by just 1 and 2,020,032, it is not a prime number.