It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 521 is not a prime number.
For example, 120 521 can be divided by 191: 120 521 / 191 = 631.
For 120 521 to be a prime number, it would have been required that 120 521 has only two divisors, i.e., itself and 1.
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120 521 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 120 521 is about 347.161.
Thus, the square root of 120 521 is not an integer, and therefore 120 521 is not a square number.
The square of a number (here 120 521) is the result of the product of this number (120 521) by itself (i.e., 120 521 × 120 521); the square of 120 521 is sometimes called "raising 120 521 to the power 2", or "120 521 squared".
The square of 120 521 is 14 525 311 441 because 120 521 × 120 521 = 120 5212 = 14 525 311 441.
As a consequence, 120 521 is the square root of 14 525 311 441.
The multiples of 120 521 are all integers evenly divisible by 120 521, that is all numbers such that the remainder of the division by 120 521 is zero. There are infinitely many multiples of 120 521. The smallest multiples of 120 521 are: