Q: Is 671,408 a Prime Number?
A: No, 671,408 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 671408 can be evenly divided by 1 2 4 8 16 29 58 116 232 464 1,447 2,894 5,788 11,576 23,152 41,963 83,926 167,852 335,704 and 671,408, with no remainder.
Since 671,408 cannot be divided by just 1 and 671,408, it is not a prime number.