We can think of the rate of visitors who purchased the product as the number of successes in an "experiment" that repeated 1382 times.
Therefore, that ratio of buyers/(total visitors) follows a binomial distribution. For 23 successes and 1382 attempts, its standard deviation can be estimated at around 4,75 (see https://en.wikipedia.org/wiki/Binomial_distribution)
About 95% of the time, you should expect results within two standard deviations of the mean, so I would build a confidence interval at around "from 13 to 32".
This means that, every 1382 visitors, you should expect between 13 and 32 purchases (in other words, between 1% and 2,3%)
I hope this helped!
EDIT NOTE: On my first answer I rushed through the calculations and made it wrong. It's done again properly and the results are now correct!