It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 991 is not a prime number.
For example, 120 991 can be divided by 13: 120 991 / 13 = 9 307.
For 120 991 to be a prime number, it would have been required that 120 991 has only two divisors, i.e., itself and 1.
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120 991 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 120 991 is about 347.838.
Thus, the square root of 120 991 is not an integer, and therefore 120 991 is not a square number.
The square of a number (here 120 991) is the result of the product of this number (120 991) by itself (i.e., 120 991 × 120 991); the square of 120 991 is sometimes called "raising 120 991 to the power 2", or "120 991 squared".
The square of 120 991 is 14 638 822 081 because 120 991 × 120 991 = 120 9912 = 14 638 822 081.
As a consequence, 120 991 is the square root of 14 638 822 081.
The multiples of 120 991 are all integers evenly divisible by 120 991, that is all numbers such that the remainder of the division by 120 991 is zero. There are infinitely many multiples of 120 991. The smallest multiples of 120 991 are: