It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 629 121 is not a prime number.
For example, 1 629 121 can be divided by 13: 1 629 121 / 13 = 125 317.
For 1 629 121 to be a prime number, it would have been required that 1 629 121 has only two divisors, i.e., itself and 1.
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1 629 121 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 1 629 121 is about 1 276.370.
Thus, the square root of 1 629 121 is not an integer, and therefore 1 629 121 is not a square number.
The square of a number (here 1 629 121) is the result of the product of this number (1 629 121) by itself (i.e., 1 629 121 × 1 629 121); the square of 1 629 121 is sometimes called "raising 1 629 121 to the power 2", or "1 629 121 squared".
The square of 1 629 121 is 2 654 035 232 641 because 1 629 121 × 1 629 121 = 1 629 1212 = 2 654 035 232 641.
As a consequence, 1 629 121 is the square root of 2 654 035 232 641.
The multiples of 1 629 121 are all integers evenly divisible by 1 629 121, that is all numbers such that the remainder of the division by 1 629 121 is zero. There are infinitely many multiples of 1 629 121. The smallest multiples of 1 629 121 are: