Q: Is 631,000 a Prime Number?
A: No, 631,000 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 631000 can be evenly divided by 1 2 4 5 8 10 20 25 40 50 100 125 200 250 500 631 1,000 1,262 2,524 3,155 5,048 6,310 12,620 15,775 25,240 31,550 63,100 78,875 126,200 157,750 315,500 and 631,000, with no remainder.
Since 631,000 cannot be divided by just 1 and 631,000, it is not a prime number.