[Python] Check for prime number

I'm using python to check if a number is prime or not, but when I write 15 it gave me True

import math
def isPrime(i):
if i == 2 or i == 3:
return True
if i < 2:
return False
if i % 2 == 0:
return False
for j in range(3,int(math.sqrt(i))):
if i % j == 0:
return False
return True
while True:
print(isPrime(int(input())))


Are there any solutions?

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