Your crystal doesn't show enough digits to see why it's a common value.
The "exact" number should be 4.194304 MHz, which is 2^22. It can be
divided by this base-2 integer conveniently to make 1 Hz for clock use.
The crystal marking, especially on small, common parts is often rounded
or truncated, but users know what it's supposed to be. If you see "3.58"
on a crystal in a NTSC TV set, you know the right digits to six places
if you're familiar with the use.
Ed
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