Is true that the leprachaunexist only in 17 of march my teacher said that every day the leprucan call hers?

the leprachaun said you can catch me the leprachaun call his brothers to, the leprachaun go to my school i saw him is this true that if you saw him dont blink or youre going to have bad luck or you catch the leprachaun he takes you to his house please answer me
Update: they take you to their home with has coins rainbow i think they exist cause i saw one
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