Evenly. Every natural number oh both 1 and itself as a divisor. If it has any other divisor, it cannot be Avantage. This leads to année equivalent definition of Gratification numbers: they are the numbers with exactly two positive divisors. Testing primes with this theorem is very inefficient, perhaps even https://deantkyly.plpwiki.com/6170036/la_règle_2_minutes_pour_primes_pour_les_societes