Q: Is 143,405 a Prime Number?
A: No, 143,405 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 143405 can be evenly divided by 1 5 23 29 43 115 145 215 667 989 1,247 3,335 4,945 6,235 28,681 and 143,405, with no remainder.
Since 143,405 cannot be divided by just 1 and 143,405, it is not a prime number.