A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3226600 can be evenly divided by 1 2 4 5 8 10 13 17 20 25 26 34 40 50 52 65 68 73 85 100 104 130 136 146 170 200 221 260 292 325 340 365 425 442 520 584 650 680 730 850 884 949 1,105 1,241 1,300 1,460 1,700 1,768 1,825 1,898 2,210 2,482 2,600 2,920 3,400 3,650 3,796 4,420 4,745 4,964 5,525 6,205 7,300 7,592 8,840 9,490 9,928 11,050 12,410 14,600 16,133 18,980 22,100 23,725 24,820 31,025 32,266 37,960 44,200 47,450 49,640 62,050 64,532 80,665 94,900 124,100 129,064 161,330 189,800 248,200 322,660 403,325 645,320 806,650 1,613,300 and 3,226,600, with no remainder.
Since 3,226,600 cannot be divided by just 1 and 3,226,600, it is not a prime number.