It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 120 423 is not a prime number.
For example, 120 423 can be divided by 3: 120 423 / 3 = 40 141.
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For 120 423 to be a prime number, it would have been required that 120 423 has only two divisors, i.e., itself and 1.
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120 423 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 120 423 is about 347.020.
Thus, the square root of 120 423 is not an integer, and therefore 120 423 is not a square number.
The square of a number (here 120 423) is the result of the product of this number (120 423) by itself (i.e., 120 423 × 120 423); the square of 120 423 is sometimes called "raising 120 423 to the power 2", or "120 423 squared".
The square of 120 423 is 14 501 698 929 because 120 423 × 120 423 = 120 4232 = 14 501 698 929.
As a consequence, 120 423 is the square root of 14 501 698 929.
The multiples of 120 423 are all integers evenly divisible by 120 423, that is all numbers such that the remainder of the division by 120 423 is zero. There are infinitely many multiples of 120 423. The smallest multiples of 120 423 are: