Adding a string to start of one column [closed]

I have this dataframe

> head(mut)
sample chr     pos ref alt
1  t_005   1  928006   G   A
2  t_005   1 1649842   G   T
3  t_005   1 2020408   G   A
4  t_005   1 2031677   T   A
5  t_005   1 2901878   G   A
6  t_005   1 3039338   G   A
>


How I can add "chr" to the chr column? I mean, instead of "1" I want "chr1", etc.

• This is basic R question and more suitable to StackOverflow main site, and it is already has been asked many times, see here for example Apr 1 '19 at 9:21

mut$$chr <- paste("chr", mut$$chr, sep = "")