Only if you're representing it as an ASCII or UTF-8 string with one byte per character, or if you're using binary-coded decimal with 8 bits instead of the typic

Only if you're representing it as an ASCII or UTF-8 string with one byte per character, or if you're using binary-coded decimal with 8 bits instead of the typical 4 for each decimal digit. 256 (3 digits) in base 2 is one byte, 65,536 (5 digits) is two bytes, 16,777,216 (8 digits) is three bytes, 4,294,967,296 (10 digits) is four bytes, etc. Those aren't 3, 5, 8, and 10 bytes, they're 1, 2, 3, and 4.