Underline numbers in matrix

General Usage
3

This underlines the squares, but the alignment is off:

julia> issquare(n) = isqrt(n)^2 == n

julia> import Markdown

julia> [Markdown.parse(issquare(i) ? "_$(i)_" : "$i")  for i in reshape(1:100,10,10)]

This prints the squares in bold (using Unicode bold digits):

julia> boldnum(n::Integer) = map(c -> c + ('𝟎'-'0'), string(n))

julia> [Text(issquare(i) ? boldnum(i) : "$i")  for i in reshape(1:100,10,10)]
10×10 Matrix{Text{String}}:
 𝟏   11  21  31  41  51  61  71  𝟖𝟏  91
 2   12  22  32  42  52  62  72  82  92
 3   13  23  33  43  53  63  73  83  93
 𝟒   14  24  34  44  54  𝟔𝟒  74  84  94
 5   15  𝟐𝟓  35  45  55  65  75  85  95
 6   𝟏𝟔  26  𝟑𝟔  46  56  66  76  86  96
 7   17  27  37  47  57  67  77  87  97
 8   18  28  38  48  58  68  78  88  98
 𝟗   19  29  39  𝟒𝟗  59  69  79  89  99
 10  20  30  40  50  60  70  80  90  𝟏𝟎𝟎
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