Q: Is 421,000 a Prime Number?
A: No, 421,000 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 421000 can be evenly divided by 1 2 4 5 8 10 20 25 40 50 100 125 200 250 421 500 842 1,000 1,684 2,105 3,368 4,210 8,420 10,525 16,840 21,050 42,100 52,625 84,200 105,250 210,500 and 421,000, with no remainder.
Since 421,000 cannot be divided by just 1 and 421,000, it is not a prime number.