Yes, by one and itself (it is a prime number).
0.1245
257
Yes, 257 is an integer. An integer is any number that does not have a fractional or decimal part. 257 fits this definition as it is a whole number without any digits after the decimal point.
Any number higher than 257. EX. 258, 259, 260 ect.
257
42.8333
7.1389
32.125
Yes.Yes, 257 is a whole number.
19.7692
233.6364