Q: Is 6,778,421 a Prime Number?
A: No, 6,778,421 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 6778421 can be evenly divided by 1 13 19 169 247 2,111 3,211 27,443 40,109 356,759 521,417 and 6,778,421, with no remainder.
Since 6,778,421 cannot be divided by just 1 and 6,778,421, it is not a prime number.