As the numbers are written, none of them are irrational because they are all terminating decimals:
[tex]3.624=\dfrac{3624}{1000}=\dfrac{453}{125}[/tex]
[tex]0.6=\dfrac6{10}=\dfrac35[/tex]
[tex]0.87=\dfrac{87}{100}[/tex]
[tex]-5=-\dfrac51[/tex]
Perhaps there is some missing notation in your question?
