Testing if integer in PBI (M not DAX)

I am not sure if M has a syntax that can check for "is integer". If someone knows about it and please points me to the right direction that would be great.

In the meantime, I thought of something like this.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("LYzBDcAwCAN3ybtC2IWUzBJl/zUaBP7Yhy32HiokOM6T0dzdXqJxtkfeYhVWCWG7pqzhm8RS9lLivoZXeffnBw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type number}}),
    #"Duplicated Column" = Table.DuplicateColumn(#"Changed Type", "Column1", "Column1 - Copy"),
    #"Changed Type1" = Table.TransformColumnTypes(#"Duplicated Column",{{"Column1 - Copy", type text}}),
    #"Split Column by Delimiter" = Table.SplitColumn(#"Changed Type1", "Column1 - Copy", Splitter.SplitTextByDelimiter(".", QuoteStyle.Csv), {"Column1 - Copy.1", "Column1 - Copy.2"}),
    #"Changed Type2" = Table.TransformColumnTypes(#"Split Column by Delimiter",{{"Column1 - Copy.1", Int64.Type}, {"Column1 - Copy.2", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type2", "Custom", each if [#"Column1 - Copy.2"]=null then "T" else "F"),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Column1 - Copy.1", "Column1 - Copy.2"})
in
    #"Removed Columns"