It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 202 423 is not a prime number.
For example, 202 423 can be divided by 13: 202 423 / 13 = 15 571.
For 202 423 to be a prime number, it would have been required that 202 423 has only two divisors, i.e., itself and 1.
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202 423 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 202 423 is about 449.914.
Thus, the square root of 202 423 is not an integer, and therefore 202 423 is not a square number.
The square of a number (here 202 423) is the result of the product of this number (202 423) by itself (i.e., 202 423 × 202 423); the square of 202 423 is sometimes called "raising 202 423 to the power 2", or "202 423 squared".
The square of 202 423 is 40 975 070 929 because 202 423 × 202 423 = 202 4232 = 40 975 070 929.
As a consequence, 202 423 is the square root of 40 975 070 929.
The multiples of 202 423 are all integers evenly divisible by 202 423, that is all numbers such that the remainder of the division by 202 423 is zero. There are infinitely many multiples of 202 423. The smallest multiples of 202 423 are: