Q: Is 1,550,421 a Prime Number?
A: No, 1,550,421 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 1550421 can be evenly divided by 1 3 9 27 81 19,141 57,423 172,269 516,807 and 1,550,421, with no remainder.
Since 1,550,421 cannot be divided by just 1 and 1,550,421, it is not a prime number.