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Inconsistency in function return value

│ SageMath version 9.0, Release Date: 2020-01-01                     │
│ Using Python 3.7.3. Type "help()" for help.                        │
sage: p = lambda x: (x - 1) / 2
sage: p(11)
sage: is_prime(5)
sage: is_prime(p(11))

In above example, is_prime function returns true when called like is_prime(5). However, when I give it p(11), which returns 5, as an argument, function returns false.

What is the reason for this behaviour, and how can I fix it?