A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3577000 can be evenly divided by 1 2 4 5 7 8 10 14 20 25 28 35 40 49 50 56 70 73 98 100 125 140 146 175 196 200 245 250 280 292 350 365 392 490 500 511 584 700 730 875 980 1,000 1,022 1,225 1,400 1,460 1,750 1,825 1,960 2,044 2,450 2,555 2,920 3,500 3,577 3,650 4,088 4,900 5,110 6,125 7,000 7,154 7,300 9,125 9,800 10,220 12,250 12,775 14,308 14,600 17,885 18,250 20,440 24,500 25,550 28,616 35,770 36,500 49,000 51,100 63,875 71,540 73,000 89,425 102,200 127,750 143,080 178,850 255,500 357,700 447,125 511,000 715,400 894,250 1,788,500 and 3,577,000, with no remainder.
Since 3,577,000 cannot be divided by just 1 and 3,577,000, it is not a prime number.