Being on time each day is necessary condition for keeping this job. Suppose there are integers a and b that are both prime and even. Since a is prime, its only divisors are 1 and itself. The product of any two even integerS is even. The sum of any two even integers is even.
Every integer is a rational number.
The sum of any two rational numbers is rational. 1 is divisible by a prime number. Any integer is either even or odd. Any two consecutive integers have opposite parity. The sum of any rational number and any irrational number is irrational.