There isn't a Prime number between 63 and 65
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The integer / whole number between 63 and 65 is 64. Any number that you can write down that's more than 63 and less than 65 is a rational number between 63 and 65. There are an infinite number of them, including . . . 63.0000000001 63.01 63.1 63.99909990901 64 64.00001 . . etc.
The prime numbers between 65 and 75 are: 67, 71 and 73
67 is prime.
The prime numbers between 45 and 65 are: 47, 53, 59 and 61
A prime number is an integer that can not be written as a product of two or more integers. For instance: 6 = 2 x 3, so it is not a prime number. 27 = 9 x 3, so it is not a prime number 105 = 5 x 21 = 3 x 5 x 7, so it is not a prime number 23 can not be written as a product of integers, so it is a prime number. All even numbers are prime numbers, because they can be written as multiple of 2. 61 is a prime number, 62 is not, 63 is not, 64 is not, 65 is not, 66 is not, 67 is, etc...