The only number which is not a Prime number in that list is 49 - it is equal to seven squared.
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The closest prime number before 49 is 47. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. In this case, 47 is the largest prime number less than 49, as it is not divisible by any other number except 1 and 47.
31 37 41 43 47 are the prime numbers between 30 & 50. Scientists announced they found the highest Prime Number. It has something like one billion numerals in the number.
31 is a prime number and has no factors other than 1 and itself. The factors of 49 are 1, 7, and 49.
It is 31 because it has only two factors which are itself and one
47