Q: Is 1,638,720 a Prime Number?
A: No, 1,638,720 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 1638720 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 64 72 80 90 96 120 144 160 180 192 240 288 320 360 480 569 576 720 960 1,138 1,440 1,707 2,276 2,845 2,880 3,414 4,552 5,121 5,690 6,828 8,535 9,104 10,242 11,380 13,656 17,070 18,208 20,484 22,760 25,605 27,312 34,140 36,416 40,968 45,520 51,210 54,624 68,280 81,936 91,040 102,420 109,248 136,560 163,872 182,080 204,840 273,120 327,744 409,680 546,240 819,360 and 1,638,720, with no remainder.
Since 1,638,720 cannot be divided by just 1 and 1,638,720, it is not a prime number.