Q: Is 550,221 a Prime Number?
A: No, 550,221 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 550221 can be evenly divided by 1 3 7 19 21 49 57 133 147 197 399 591 931 1,379 2,793 3,743 4,137 9,653 11,229 26,201 28,959 78,603 183,407 and 550,221, with no remainder.
Since 550,221 cannot be divided by just 1 and 550,221, it is not a prime number.