Q: Is 6,635,421 a Prime Number?
A: No, 6,635,421 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 6635421 can be evenly divided by 1 3 9 13 39 117 56,713 170,139 510,417 737,269 2,211,807 and 6,635,421, with no remainder.
Since 6,635,421 cannot be divided by just 1 and 6,635,421, it is not a prime number.