It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 121 042 is not a prime number.
For example, 7 121 042 can be divided by 2: 7 121 042 / 2 = 3 560 521.
For 7 121 042 to be a prime number, it would have been required that 7 121 042 has only two divisors, i.e., itself and 1.
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7 121 042 is an even number, because it is evenly divisible by 2: 7 121 042 / 2 = 3 560 521.
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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 7 121 042 is about 2 668.528.
Thus, the square root of 7 121 042 is not an integer, and therefore 7 121 042 is not a square number.
The square of a number (here 7 121 042) is the result of the product of this number (7 121 042) by itself (i.e., 7 121 042 × 7 121 042); the square of 7 121 042 is sometimes called "raising 7 121 042 to the power 2", or "7 121 042 squared".
The square of 7 121 042 is 50 709 239 165 764 because 7 121 042 × 7 121 042 = 7 121 0422 = 50 709 239 165 764.
As a consequence, 7 121 042 is the square root of 50 709 239 165 764.
The multiples of 7 121 042 are all integers evenly divisible by 7 121 042, that is all numbers such that the remainder of the division by 7 121 042 is zero. There are infinitely many multiples of 7 121 042. The smallest multiples of 7 121 042 are: