It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 921 is not a prime number.
For example, 120 921 can be divided by 3: 120 921 / 3 = 40 307.
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For 120 921 to be a prime number, it would have been required that 120 921 has only two divisors, i.e., itself and 1.
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120 921 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 120 921 is about 347.737.
Thus, the square root of 120 921 is not an integer, and therefore 120 921 is not a square number.
The square of a number (here 120 921) is the result of the product of this number (120 921) by itself (i.e., 120 921 × 120 921); the square of 120 921 is sometimes called "raising 120 921 to the power 2", or "120 921 squared".
The square of 120 921 is 14 621 888 241 because 120 921 × 120 921 = 120 9212 = 14 621 888 241.
As a consequence, 120 921 is the square root of 14 621 888 241.
The multiples of 120 921 are all integers evenly divisible by 120 921, that is all numbers such that the remainder of the division by 120 921 is zero. There are infinitely many multiples of 120 921. The smallest multiples of 120 921 are: