Q: Is 1,221,000 a Prime Number?
A: No, 1,221,000 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1221000 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 20 22 24 25 30 33 37 40 44 50 55 60 66 74 75 88 100 110 111 120 125 132 148 150 165 185 200 220 222 250 264 275 296 300 330 370 375 407 440 444 500 550 555 600 660 740 750 814 825 888 925 1,000 1,100 1,110 1,221 1,320 1,375 1,480 1,500 1,628 1,650 1,850 2,035 2,200 2,220 2,442 2,750 2,775 3,000 3,256 3,300 3,700 4,070 4,125 4,440 4,625 4,884 5,500 5,550 6,105 6,600 7,400 8,140 8,250 9,250 9,768 10,175 11,000 11,100 12,210 13,875 16,280 16,500 18,500 20,350 22,200 24,420 27,750 30,525 33,000 37,000 40,700 48,840 50,875 55,500 61,050 81,400 101,750 111,000 122,100 152,625 203,500 244,200 305,250 407,000 610,500 and 1,221,000, with no remainder.
Since 1,221,000 cannot be divided by just 1 and 1,221,000, it is not a prime number.