Q: Is 221,536 a Prime Number?
A: No, 221,536 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 221536 can be evenly divided by 1 2 4 7 8 14 16 23 28 32 43 46 56 86 92 112 161 172 184 224 301 322 344 368 602 644 688 736 989 1,204 1,288 1,376 1,978 2,408 2,576 3,956 4,816 5,152 6,923 7,912 9,632 13,846 15,824 27,692 31,648 55,384 110,768 and 221,536, with no remainder.
Since 221,536 cannot be divided by just 1 and 221,536, it is not a prime number.