It is 31 because it has only two factors which are itself and one
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31 is a prime number and has no factors other than 1 and itself. The factors of 49 are 1, 7, and 49.
The only number which is not a prime number in that list is 49 - it is equal to seven squared.
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.
49 is not a prime number. It is the square of the prime number 7.
49 is a prime number itself.