def divider(n):
    i = 2
    j = 0 
    while i**2 <= n and j != 1:
       if n%i == 0:
       j = 1
       i += 1
    if j == 1:
       print ("This is not a prime number")
    else:
       print ("This is a prime number")
n=2019
divider(n)


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