Because it has no divisors other than itself and one. That is the definition of a Prime number.
No.
It's divisible by a million: 31 million = 31 x 1 million.
Along with being divisible by 10, 100, 1000, 10000, 100000 amongst others.
Yes, 31 is a prime because it can only be divided by 1 and itself.
On its own 31 is a prime number because it only has two factors which are itself and one
Yes.
Yes.
31 is a prime number
31 is a prime number
31 has no prime factors because it is a prime number so it has two factors, 1 and 31.
31 is a prime number. Its only prime factor is 31.
31 is prime.
31 is a prime number
1 and 31 (31 is a Prime number).
31 is a prime number
31 is prime so 31 is the prime factorization of 31
31 is already a prime number.
31 has no prime factors because it is a prime number so it has two factors, 1 and 31.
31 is a prime number. Its only prime factor is 31.
31 is a Prime Number.
31 is prime.
31 is a prime number.
The next prime number after 31 is 37
31 is a prime number.