It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 897 538 is not a prime number.
For example, 7 897 538 can be divided by 2: 7 897 538 / 2 = 3 948 769.
For 7 897 538 to be a prime number, it would have been required that 7 897 538 has only two divisors, i.e., itself and 1.
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7 897 538 is an even number, because it is evenly divisible by 2: 7 897 538 / 2 = 3 948 769.
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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 7 897 538 is about 2 810.256.
Thus, the square root of 7 897 538 is not an integer, and therefore 7 897 538 is not a square number.
The square of a number (here 7 897 538) is the result of the product of this number (7 897 538) by itself (i.e., 7 897 538 × 7 897 538); the square of 7 897 538 is sometimes called "raising 7 897 538 to the power 2", or "7 897 538 squared".
The square of 7 897 538 is 62 371 106 461 444 because 7 897 538 × 7 897 538 = 7 897 5382 = 62 371 106 461 444.
As a consequence, 7 897 538 is the square root of 62 371 106 461 444.
The multiples of 7 897 538 are all integers evenly divisible by 7 897 538, that is all numbers such that the remainder of the division by 7 897 538 is zero. There are infinitely many multiples of 7 897 538. The smallest multiples of 7 897 538 are: