Q: Is 513,681 a Prime Number?
A: No, 513,681 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 513681 can be evenly divided by 1 3 7 21 61 183 401 427 1,203 1,281 2,807 8,421 24,461 73,383 171,227 and 513,681, with no remainder.
Since 513,681 cannot be divided by just 1 and 513,681, it is not a prime number.