It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 121 891 is not a prime number.
For example, 1 121 891 can be divided by 673: 1 121 891 / 673 = 1 667.
For 1 121 891 to be a prime number, it would have been required that 1 121 891 has only two divisors, i.e., itself and 1.
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1 121 891 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 1 121 891 is about 1 059.194.
Thus, the square root of 1 121 891 is not an integer, and therefore 1 121 891 is not a square number.
The square of a number (here 1 121 891) is the result of the product of this number (1 121 891) by itself (i.e., 1 121 891 × 1 121 891); the square of 1 121 891 is sometimes called "raising 1 121 891 to the power 2", or "1 121 891 squared".
The square of 1 121 891 is 1 258 639 415 881 because 1 121 891 × 1 121 891 = 1 121 8912 = 1 258 639 415 881.
As a consequence, 1 121 891 is the square root of 1 258 639 415 881.
The multiples of 1 121 891 are all integers evenly divisible by 1 121 891, that is all numbers such that the remainder of the division by 1 121 891 is zero. There are infinitely many multiples of 1 121 891. The smallest multiples of 1 121 891 are: