Q: Is 5,129,721 a Prime Number?
A: No, 5,129,721 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 5129721 can be evenly divided by 1 3 9 47 67 141 181 201 423 543 603 1,629 3,149 8,507 9,447 12,127 25,521 28,341 36,381 76,563 109,143 569,969 1,709,907 and 5,129,721, with no remainder.
Since 5,129,721 cannot be divided by just 1 and 5,129,721, it is not a prime number.