Prime number seems to be trending topic for programming contest. As such, Piyash, being an aspiring competitive programmer, started learning about theories and algorithms related to prime numbers. A prime number is a positive integer
$p \gt 1$ that has no positive integer divisors other than
$p$ itself. Piyash read somewhere that all prime numbers except
$2$ are odd.
This is a companion discussion topic for the original entry at https://toph.co/p/odd-prime