Q: Is 5,401,638 a Prime Number?
A: No, 5,401,638 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 5401638 can be evenly divided by 1 2 3 6 9 11 18 22 33 66 99 198 27,281 54,562 81,843 163,686 245,529 300,091 491,058 600,182 900,273 1,800,546 2,700,819 and 5,401,638, with no remainder.
Since 5,401,638 cannot be divided by just 1 and 5,401,638, it is not a prime number.