Q: Is 1,205,421 a Prime Number?
A: No, 1,205,421 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 1205421 can be evenly divided by 1 3 7 21 61 183 427 941 1,281 2,823 6,587 19,761 57,401 172,203 401,807 and 1,205,421, with no remainder.
Since 1,205,421 cannot be divided by just 1 and 1,205,421, it is not a prime number.