Either way, it seems a slightly awkward thing to say. If thing shown is literally a number, then why not say "The value/number above is 25", if indeed you need to explain it? If the thing shown is some other kind of object that is 25th in a series, then you probably wouldn't say "value".
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New HopeHave a look at the number 2423.It's possible, but one wonders in what context you are saying it. Do you want the person to investigate the mathematical properties of 2423? Examine the typeface in which the numerals are written? Or what?
New HopeCan you show the number 3452?"show" in what sense? Again, more context
New HopeLook at the number 2456. Can you tell the value of each digit in the number?Yes, that's OK then.