Q: Is 686,000 a Prime Number?
A: No, 686,000 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 686000 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 25 28 35 40 49 50 56 70 80 98 100 112 125 140 175 196 200 245 250 280 343 350 392 400 490 500 560 686 700 784 875 980 1,000 1,225 1,372 1,400 1,715 1,750 1,960 2,000 2,450 2,744 2,800 3,430 3,500 3,920 4,900 5,488 6,125 6,860 7,000 8,575 9,800 12,250 13,720 14,000 17,150 19,600 24,500 27,440 34,300 42,875 49,000 68,600 85,750 98,000 137,200 171,500 343,000 and 686,000, with no remainder.
Since 686,000 cannot be divided by just 1 and 686,000, it is not a prime number.