It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 129 021 is not a prime number.
For example, 7 129 021 can be divided by 241: 7 129 021 / 241 = 29 581.
For 7 129 021 to be a prime number, it would have been required that 7 129 021 has only two divisors, i.e., itself and 1.
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7 129 021 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 7 129 021 is about 2 670.023.
Thus, the square root of 7 129 021 is not an integer, and therefore 7 129 021 is not a square number.
The square of a number (here 7 129 021) is the result of the product of this number (7 129 021) by itself (i.e., 7 129 021 × 7 129 021); the square of 7 129 021 is sometimes called "raising 7 129 021 to the power 2", or "7 129 021 squared".
The square of 7 129 021 is 50 822 940 418 441 because 7 129 021 × 7 129 021 = 7 129 0212 = 50 822 940 418 441.
As a consequence, 7 129 021 is the square root of 50 822 940 418 441.
The multiples of 7 129 021 are all integers evenly divisible by 7 129 021, that is all numbers such that the remainder of the division by 7 129 021 is zero. There are infinitely many multiples of 7 129 021. The smallest multiples of 7 129 021 are: