Q: Is 661,563 a Prime Number?
A: No, 661,563 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 661563 can be evenly divided by 1 3 7 9 21 63 10,501 31,503 73,507 94,509 220,521 and 661,563, with no remainder.
Since 661,563 cannot be divided by just 1 and 661,563, it is not a prime number.