Incorrect

There are exactly 2 million nibbles in a megabyte (MB).

Correct:

4 Bits = 1 Nibble

8 Bits = 1 Byte

1024 Bytes = 1 KiloByte

1024 KiloBytes = 1 MegaByte

1024 MegaBytes = 1 GigaByte

1024 GigaBytes = 1 TeraByte

2 x 1024 x 1024 = 2,097,152

There are 2,097,152 Nibbles in a MegaByte

mega- is the SI prefix for "1 million", so 1 MB = 1,000,000 bytes.

1 byte = 2 nibbles, so 1 MB = 2,000,000 nibbles.

There are 2,097,152 nibbles in a mebibyte (MiB).

4 bits = 1 nibble (or nybble)

2 nibbles = 1 byte

1024 bytes = 1 kibibyte (KiB)

1024 kibibytes = 1 mebibyte

1024 x 1024 = bytes in a mebibyte

Here is the math:

bytes in a mebibyte x 2 = nibbles in mebibyte

2 x 1024 x 1024 = 2,097,152

8,388,608 bits = 1,048,576 bytes = 1.048 megabytes (MB) = 1 mebibyte (MiB).

The units are wrong. A megabyte is a 1000 kilobytes, and a megabit is 1000 kilobits. So 1/1000 of a megabit is a kilobit. As a unit gets larger for the same amount, the decimal point gets moved further to the left.

Now, if you mean the older terminology when everything was based on 1024, that was all given new prefixes. So a mebibyte is 1024 kibibytes, thus a kibibyte is 1/1024 of a mebibyte.

MB stands For Megabyte (well actually Mebibyte but everyone calls them Megabytes anyway) and KB is Kilobyte (Kibibyte, same deal). 1 MB = 1024KB