No, 7 * 7 + 1 = 50, which is divisible by 2 and 5.
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Nope - 81 is a square number, and the next one is 100. 89 is actually a PRIME number
The previous prime number is 23,456,787,559 and the next prime number is 23,456,787,593.
The next prime number after 24 is: 29
97 is the next prime number after 91.
43 is a prime number and the next prime number after it is 47