It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 553 is not a prime number.
For example, 120 553 can be divided by 29: 120 553 / 29 = 4 157.
For 120 553 to be a prime number, it would have been required that 120 553 has only two divisors, i.e., itself and 1.
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120 553 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 120 553 is about 347.207.
Thus, the square root of 120 553 is not an integer, and therefore 120 553 is not a square number.
The square of a number (here 120 553) is the result of the product of this number (120 553) by itself (i.e., 120 553 × 120 553); the square of 120 553 is sometimes called "raising 120 553 to the power 2", or "120 553 squared".
The square of 120 553 is 14 533 025 809 because 120 553 × 120 553 = 120 5532 = 14 533 025 809.
As a consequence, 120 553 is the square root of 14 533 025 809.
The multiples of 120 553 are all integers evenly divisible by 120 553, that is all numbers such that the remainder of the division by 120 553 is zero. There are infinitely many multiples of 120 553. The smallest multiples of 120 553 are: