It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 971 371 is not a prime number.
For example, 7 971 371 can be divided by 31: 7 971 371 / 31 = 257 141.
For 7 971 371 to be a prime number, it would have been required that 7 971 371 has only two divisors, i.e., itself and 1.
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7 971 371 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 7 971 371 is about 2 823.362.
Thus, the square root of 7 971 371 is not an integer, and therefore 7 971 371 is not a square number.
The square of a number (here 7 971 371) is the result of the product of this number (7 971 371) by itself (i.e., 7 971 371 × 7 971 371); the square of 7 971 371 is sometimes called "raising 7 971 371 to the power 2", or "7 971 371 squared".
The square of 7 971 371 is 63 542 755 619 641 because 7 971 371 × 7 971 371 = 7 971 3712 = 63 542 755 619 641.
As a consequence, 7 971 371 is the square root of 63 542 755 619 641.
The multiples of 7 971 371 are all integers evenly divisible by 7 971 371, that is all numbers such that the remainder of the division by 7 971 371 is zero. There are infinitely many multiples of 7 971 371. The smallest multiples of 7 971 371 are: