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two
There are only five distinct odd digits.
5555
You had me until "product." The product of 4 digits can't be prime.
Using the digits, we can make 81 x 62 equals 5022, which is the largest possible product. To make the smallest possible product, do 268 x 1 = 268.
If you mean, "What is the largest number of digits possible in the product of two 2-digit numbers" then 99 * 99 = 9801, or 4 digits. Anything down to 59 * 17 = 1003 will have 4 digits.
It can have 4 digits, because the highest possible two digit numbers 99*99=9801.
Forming three three digit numbers that use the numbers 1-9 without repeating, the highest product possible is 611,721,516. This is formed from the numbers 941, 852, and 763.
two
There are only five distinct odd digits.
5555
It should be obvious (it is, isn't it? am I expecting too much of today's educational system?) that the largest possible result of multiplying two two digit numbers is 99x99 = 9801, which has four digits, and the smallest possible result is 10x10 = 100, which has three digits.
1,2,3,4 1+2+3+4=10 4 times 3 times 2 times 1 =24 24 counting numbers
4,536 whole numbers or mixed numbers. 5,040 pure decimals.
x is 987 subtract y is 123 ,which 987-123=864.
67/72 of them.
52 is a number whose digits have a product of 10.