It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 121 542 is not a prime number.
For example, 7 121 542 can be divided by 2: 7 121 542 / 2 = 3 560 771.
For 7 121 542 to be a prime number, it would have been required that 7 121 542 has only two divisors, i.e., itself and 1.
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7 121 542 is an even number, because it is evenly divisible by 2: 7 121 542 / 2 = 3 560 771.
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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 7 121 542 is about 2 668.622.
Thus, the square root of 7 121 542 is not an integer, and therefore 7 121 542 is not a square number.
The square of a number (here 7 121 542) is the result of the product of this number (7 121 542) by itself (i.e., 7 121 542 × 7 121 542); the square of 7 121 542 is sometimes called "raising 7 121 542 to the power 2", or "7 121 542 squared".
The square of 7 121 542 is 50 716 360 457 764 because 7 121 542 × 7 121 542 = 7 121 5422 = 50 716 360 457 764.
As a consequence, 7 121 542 is the square root of 50 716 360 457 764.
The multiples of 7 121 542 are all integers evenly divisible by 7 121 542, that is all numbers such that the remainder of the division by 7 121 542 is zero. There are infinitely many multiples of 7 121 542. The smallest multiples of 7 121 542 are: