I would like to figure out whether or not each value in my column is a numerical value or a non-numerical value.

```
df = data.frame(help = c(456, 'superduper'),
                correct_answer = c("numeric","string"))

```

I've tried is.numeric or is.character, on a row-by-row basis but this doesnt seem to work as the entire column is coded as a character.

I know this is a basic question, but any help is appreicated.