Q: Is 2,563,664 a Prime Number?
A: No, 2,563,664 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 2563664 can be evenly divided by 1 2 4 8 16 163 326 652 983 1,304 1,966 2,608 3,932 7,864 15,728 160,229 320,458 640,916 1,281,832 and 2,563,664, with no remainder.
Since 2,563,664 cannot be divided by just 1 and 2,563,664, it is not a prime number.