Is a M B 1000000 bites?

No, a megabyte (MB) is not equal to 1,000,000 bites. A megabyte is typically defined as 1,024 kilobytes (KB), and since each kilobyte is 1,024 bytes, a megabyte is actually 1,024 x 1,024 bytes, which equals 1,048,576 bytes. Therefore, 1 MB is approximately 1.05 million bytes, not 1 million bites.