It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 248 402 is not a prime number.
For example, 248 402 can be divided by 2: 248 402 / 2 = 124 201.
For 248 402 to be a prime number, it would have been required that 248 402 has only two divisors, i.e., itself and 1.
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248 402 is an even number, because it is evenly divisible by 2: 248 402 / 2 = 124 201.
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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 248 402 is about 498.399.
Thus, the square root of 248 402 is not an integer, and therefore 248 402 is not a square number.
The square of a number (here 248 402) is the result of the product of this number (248 402) by itself (i.e., 248 402 × 248 402); the square of 248 402 is sometimes called "raising 248 402 to the power 2", or "248 402 squared".
The square of 248 402 is 61 703 553 604 because 248 402 × 248 402 = 248 4022 = 61 703 553 604.
As a consequence, 248 402 is the square root of 61 703 553 604.
The multiples of 248 402 are all integers evenly divisible by 248 402, that is all numbers such that the remainder of the division by 248 402 is zero. There are infinitely many multiples of 248 402. The smallest multiples of 248 402 are: