Q: Is 643,072 a Prime Number?
A: No, 643,072 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 643072 can be evenly divided by 1 2 4 8 16 32 64 128 157 256 314 512 628 1,024 1,256 2,048 2,512 4,096 5,024 10,048 20,096 40,192 80,384 160,768 321,536 and 643,072, with no remainder.
Since 643,072 cannot be divided by just 1 and 643,072, it is not a prime number.