Q: Is 143,605 a Prime Number?
A: No, 143,605 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 143605 can be evenly divided by 1 5 7 11 35 55 77 373 385 1,865 2,611 4,103 13,055 20,515 28,721 and 143,605, with no remainder.
Since 143,605 cannot be divided by just 1 and 143,605, it is not a prime number.